200 is the natural number following 199 and preceding 201. In mathematics, a natural number is either a positive integer (1, 2, 3, 4, ...) or a non-negative integer (0, 1, 2, 3, 4, ...). The former definition is generally used in number theory, while the latter is preferred in set theory and computer science. ... 199 is the natural number between 198 and 200. ...

List of numbers — Integers << 0 100 200 300 400 500 600 700 800 900 >> This is a list of articles about numbers (not about numerals). ... The integers consist of the positive natural numbers (1, 2, 3, …), their negatives (−1, −2, −3, ...) and the number zero. ... In mathematics, −1 is the integer greater than negative two (−2) and less than 0. ... 0 (zero) is both a number and a numeral. ... 100 (one hundred) (the Roman numeral is C for centum) is the natural number following 99 and preceding 101. ... Three hundred is the natural number following two hundred and ninety-nine and preceding three hundred one. ... Four hundred is the natural number following three hundred ninety-nine and preceding four hundred one. ... Five hundred is the natural number following four hundred ninety-nine and preceding five hundred one. ... Six hundred is the natural number following five and hundred ninety-nine and preceding six hundred and one. ... 700 (seven hundred) is the natural number following 699（six hundred ninety-nine） and preceding 701（seven hundred one）. Cardinal Seven hundred Ordinal 700th Factorization Roman numeral DCC Binary 1010111100 Duodecimal 4A4 Hexadecimal 2BC Vigesimal 1F0 It is the sum of four consecutive primes (167 + 173 + 179 + 181). ... 800 is the natural number following 799 and preceding 801. ... Nine hundred is the natural number following eight hundred ninety-nine and preceding nine hundred one. ... Cardinal 1000 one thousand Ordinal 1000th Numeral system Factorization Prime Divisor(s) Roman numeral Unicode symbol(s) , , Greek Prefix chilia Latin Prefix milli Binary 1111101000 Octal 1750 Duodecimal 6B4 Hexadecimal 3E8 1000 (one thousand) is the natural number following 999 and preceding 1001. ...
Cardinal	Two hundred
Ordinal	200th
Factorization
Roman numeral	CC
Binary	11001000
Hexadecimal	C8
Hebrew	ר (Resh)

The number appears in the Padovan sequence, preceded by 86, 114, 151 (it is the sum of the first two of these). 200 is the smallest base 10 unprimeable number - it can not be turned into a prime number by changing just one of its digits to any other digit. It is also a Harshad number. In linguistics, cardinal numbers is the name given to number words that are used for quantity (one, two, three), as opposed to ordinal numbers, words that are used for order (first, second, third). ... Commonly, ordinal numbers, or ordinals for short, are numbers used to denote the position in an ordered sequence: first, second, third, fourth, etc. ... In mathematics, factorization or factoring is the decomposition of an object (for example, a number, a polynomial, or a matrix) into a product of other objects, or factors, which when multiplied together give the original. ... The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ... The binary numeral system (base 2 numerals) represents numeric values using two symbols, typically 0 and 1. ... james In mathematics and computer science, base-16, hexadecimal, or simply hex, is a numeral system with a radix or base of 16 usually written using the symbols 0–9 and A–F or a–f. ... Hebrew (עִבְרִית ‘Ivrit) is a Semitic language of the Afro-Asiatic language family spoken by more than seven million people in Israel and Jewish communities around the world. ... The Padovan sequence is the sequence of integers P(n) defined by the initial values and the recurrence relation The first few values of P(n) are 1, 1, 1, 2, 2, 3, 4, 5, 7, 9, 12, 16, 21, 28, 37 . ... A Harshad number, or Niven number, is an integer that is divisible by the sum of its digits in a given number base. ...

Two hundred is also:

• A common ISO-standard film speed for photographic films. However, 200 speed film is being phased out in consumer films in favor of faster films.
• A denomination of the euro note. The 200 euro note was designed by Robert Kalina.
• The size of main square in Krakow, Poland (200mx200m)
• 200 MeV is the temperature of quark-gluon plasma phrase transition
• An HTTP status code indicating a successful connection.
• The sum of dollars given in the classical Monopoly game to a player passing Go.
• A cholesterol level of 200 and below is considered "Desirable level corresponding to lower risk for heart disease"

The International Organization for Standardization (ISO) is an international standard-setting body composed of representatives from national standards bodies. ... Film speed is the measure of a photographic film stocks sensitivity to light. ... The euro (plural euro--but note linguistic issues concerning the euro, symbol: €; banking code: EUR) is the official currency of the European Union and single currency for over 300 million Europeans in the following twelve European Union member states: Austria, Belgium, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, the Netherlands... This article needs cleanup. ... HTTP (for HyperText Transfer Protocol) is the primary method used to convey information on the World Wide Web. ... Monopoly is one of the best-selling commercial board games in the world. ... Cholesterol chemical structure Cholesterol is a sterol (a combination steroid and alcohol) and a lipid found in the cell membranes of all body tissues, and transported in the blood plasma of all animals. ...

Other numbers in the 200s

201-209

Two hundred and one 201 = 3·67, Harshad number, also HTTP status code indicating success of a POST command, with the textual part of the response line indicating the URI by which the newly created document should be known. Also, the title of the Star Trek: The Next Generation episode "11001001", also the area code for northwestern New Jersey. The title as it appeared in most episodes opening credits. ... A telephone numbering plan is a system that allows subscribers to make and receive telephone calls across long distances. ... Official language(s) None, English de facto Capital Trenton Largest city Newark Area  Ranked 47th  - Total 8,729 sq. ...

Two hundred and two 202 = 2·101, sum of four consecutive primes (43 + 47 + 53 + 59), Smith number, nontotient, noncototient, also HTTP status code meaning the request was accepted but has not yet been fulfilled, also telephone area code for District of Columbia. A Smith number is a number which in a given base, the sum of its digits is equal to the sum of the digits in its factorization. ... A nontotient is a positive integer n which is not in the range of Eulers totient function φ, that is, for which φ(x) = n has no solution. ... A noncototient is a positive integer n that can not be expressed as the difference between a positive integer m and the number of coprime integers below it. ... A telephone numbering plan is a system that allows subscribers to make and receive telephone calls across long distances. ... ...

Two hundred three 203 = 7·29, 6th Bell number, also HTTP status code indicating partial information, also the area code for Southwest Connecticut - Fairfield & New Haven counties. The Bell numbers, named in honor of Eric Temple Bell, are a sequence of integers arising in combinatorics that begins thus (sequence A000110 in OEIS): In general, Bn is the number of partitions of a set of size n. ... A telephone numbering plan is a system that allows subscribers to make and receive telephone calls across long distances. ... Official language(s) English Capital Hartford Largest city Bridgeport Area  Ranked 48th  - Total 5,549 sq. ...

Two hundred four 204 = 2²·3·17, sum of a twin prime (101 + 103), sum of six consecutive primes (23 + 29 + 31 + 37 + 41 + 43), nonagonal number, square pyramidal number (sum of the first eight squares), Harshad number, also HTTP status code indicating the request was received but there is no response to the request, also telephone area code for Manitoba A nonagonal number or enneagonal number is a figurate number that represents a nonagon. ... A pyramidal number, or square pyramidal number, is a figurate number that represents a pyramid with a base and four sides. ... A telephone numbering plan is a system that allows subscribers to make and receive telephone calls across long distances. ... Motto: Gloriosus et Liber (Latin: Glorious and free) Official languages English (French is an official language of the Manitoban legislature and courts) Capital Winnipeg Largest city Winnipeg Lieutenant-Governor John Harvard Premier Gary Doer (NDP) Parliamentary representation  - House seat  - Senate seats 14 6 Area Total  â€¢ Land  â€¢ Water    (% of total)  Ranked...

Two hundred five 205 = 5·41, also spur routes of Interstate 5, also the area code for northern Alabama. Interstate 5 (abbreviated I-5) is the westernmost interstate highway in the United States. ... A telephone numbering plan is a system that allows subscribers to make and receive telephone calls across long distances. ... Official language(s) English Capital Montgomery Largest city Birmingham Area  Ranked 30th  - Total 52,423 sq. ...

Two hundred six 206 = 2·103, nontotient, noncototient, untouchable number, also the area code for Seattle, Washington. Also, the number of bones in a normal human skeleton according to Gray's Anatomy. An untouchable number is an integer that can not be expressed as the sum of the proper divisors of any integer. ... A telephone numbering plan is a system that allows subscribers to make and receive telephone calls across long distances. ... Seattle redirects here. ... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy, is an anatomy textbook widely regarded as a classic work on human anatomy. ...

Two hundred seven 207 = 3²·23, Wedderburn-Etherington number, Harshad number, also telephone area code for Maine A Wedderburn-Etherington number counts how many weakly binary trees can be constructed such that each graph vertex (not counting the root vertex) is adjacent to no more than three other such vertices, for a given number of nodes. ... A telephone numbering plan is a system that allows subscribers to make and receive telephone calls across long distances. ... Official language(s) None Capital Augusta Largest city Portland Area  - Total   - Width   - Length    - % water  - Latitude  - Longitude Ranked 39th 33,414 sq mi  86,542 km² 190 miles  305 km 320 miles  515 km 13. ...

Two hundred eight 208 = 2⁴·13, tetranacci number, sum of the squares of the first five primes, also telephone area code for Idaho In mathematics, the Fibonacci numbers form a sequence defined recursively by: In other words: one starts with 0 and 1, and then produces the next Fibonacci number by adding the two previous Fibonacci numbers. ... A telephone numbering plan is a system that allows subscribers to make and receive telephone calls across long distances. ... Official language(s) None Capital Boise Largest city Boise Area  Ranked 14th  - Total 83,642 sq. ...

208 is the heaviest stable isotope of any element (lead). But see bismuth General Name, Symbol, Number lead, Pb, 82 Chemical series poor metals Group, Period, Block 14, 6, p Appearance bluish white Atomic mass 207. ... General Name, Symbol, Number bismuth, Bi, 83 Chemical series poor metals Group, Period, Block 15, 6, p Appearance lustrous reddish white Atomic mass 208. ...

Two hundred nine 209 = 11·19, highly cototient number, Harshad number, self number, also the area code for Modesto, California. In number theory, a branch of mathematics, a highly cototient number k is an integer that has more solutions to the equation x - φ(x) = k, where φ is Eulers totient function, than any integer below it, with the exception of 1. ... A self number or Colombian number is an integer which, in a given base, can not be generated by any other integer added to the sum of its digits. ... A telephone numbering plan is a system that allows subscribers to make and receive telephone calls across long distances. ... Modesto is the county seat of Stanislaus County, California. ...

210-219

Two hundred ten has its own article. 210 is the natural number following 209 and preceding 211. ...

Two hundred eleven 211 prime, primorial prime, sum of three consecutive primes (67 + 71 + 73), balanced prime, Chen prime, centered decagonal number, self number, also, SMTP status code for system status A primorial prime is a number that is one less or one more than a primorial and also a prime number. ... A balanced prime is a prime number that is equal to the arithmetic mean of the nearest prime above and below. ... A prime number p is called a Chen prime if p + 2 is either a prime or a semiprime. ... A centered decagonal number is a centered figurate number that represents a decagon with a dot in the center and all other dots surrounding the center dot in successive decagonal layers. ... Simple Mail Transfer Protocol (SMTP) is the de facto standard for email transmission across the Internet. ...

Two hundred twelve 212 = 2²·53. Also in degrees Fahrenheit, the boiling point of water at sea level, also the area code for New York, New York. Fahrenheit is a temperature scale named after the German physicist Gabriel Fahrenheit (1686–1736), who proposed it in 1724. ... Water (from the Old English waeter; c. ... For considerations of sea level change, in particular rise associated with possible global warming, see sea level rise. ... A telephone numbering plan is a system that allows subscribers to make and receive telephone calls across long distances. ... Flag Seal Nickname: The Big Apple, The Capital of the World[1], Gotham Government Counties (Boroughs) Bronx (The Bronx) New York (Manhattan) Queens (Queens) Kings (Brooklyn) Richmond (Staten Island) Mayor Michael Bloomberg (R) Geographical characteristics Area    - City 1,214. ...

Two hundred thirteen 213 = 3·71, also the area code for Los Angeles, California. A telephone numbering plan is a system that allows subscribers to make and receive telephone calls across long distances. ... Nickname City of Angels Location Location within Los Angeles County in the state of California Government Country State County United States California Los Angeles County Mayor Antonio Villaraigosa (D) Geographical characteristics Area  - City    - Land    - Water  - Urban 1,290. ...

Two hundred fourteen 214 = 2·107, Mertens function returns 0, nontotient, also the number of bones in a normal human skeleton according to Sarah in Terminator 2: Judgment Day, form DD 214 documents discharge from the U.S. Armed Forces, SMTP status code for help message In number theory, the Mertens function is where μ(k) is the Möbius function. ... Terminator 2: Judgment Day (commonly abbreviated T2) is a 1991 movie directed by James Cameron and starring Arnold Schwarzenegger, Linda Hamilton, and Robert Patrick. ... The armed forces of the United States of America consist of the United States Army United States Navy United States Air Force United States Marine Corps United States Coast Guard Note: The United States Coast Guard has both military and law enforcement functions. ...

Two hundred fifteen 215 = 5·43. Also, spur routes of Interstate 15. Form DD 215 is for corrections to form DD 214. Interstate 15 (abbreviated I-15) is the fourth longest north-south transcontinental interstate highway in the United States, traveling through the states of Montana, Idaho, Utah, Arizona, Nevada, and California. ...

Two hundred sixteen 216 = 2³·3³ = 6³ = 3³ + 4³ + 5³, making it the smallest cube that's also the sum of three cubes; sum of a twin prime (107 + 109), Harshad number, untouchable number, also the number of colors in the Netscape Web-safe color palette; also ISO 216 is the ISO's standard for paper sizes Netscape Navigator, also known simply as Netscape, was a proprietary web browser that was extremely popular during the 1990s. ... ISO 216 specifies international standard (ISO) paper sizes, used in most countries in the world today. ... The International Organization for Standardization (ISO) is an international standard-setting body composed of representatives from national standards bodies. ... A comparison of different paper sizes There have been many standard sizes of paper at different times and in different countries, but today there are basically only two systems in place: the international standard (A4 and its siblings), and the North American sizes. ...

Two hundred seventeen 217 = 7·31, centered hexagonal number A centered hexagonal number, or hex number is a centered figurate number that represents a hexagon with a dot in the center and all other dots surrounding the center dot in successive hexagonal layers. ...

Two hundred eighteen 218 = 2·109, Mertens function(218) = 3 a record high that stands until 219, nontotient, noncototient In number theory, the Mertens function is where μ(k) is the Möbius function. ...

Two hundred nineteen 219 = 3·73, Mertens function(219) = 4 a record high that stands until 221, 219 is a repdigit in base 8 (333). In number theory, the Mertens function is where μ(k) is the Möbius function. ... In recreational mathematics, a repdigit is a natural number composed of repeated instances of the same digit, most often in the decimal numeral system. ...

220-229

Two hundred twenty has its own article. 220 (two hundred [and] twenty) is the natural number following 219 and preceding 221. ...

Two hundred twenty-one has its own article. 221 (two hundred [and] twenty-one) is the natural number following 220 and preceding 222. ...

Two hundred twenty-two has its own article. Two hundred twenty-two is the natural number following two hundred twenty-one and preceding two hundred twenty-three. ...

Two hundred twenty-three 223 prime, sum of three consecutive primes (71 + 73 + 79), sum of seven consecutive primes (19 + 23 + 29 + 31 + 37 + 41 + 43), smallest number requiring 37 fifth powers for Waring representation, strictly non-palindromic number; also the number of United Nations resolution 223, regarding the treatment of Israel, and the flight number of a British Airways plane believed targeted for the symbolism of its number United Nations - Wikipedia, the free encyclopedia /**/ @import /skins-1. ... For the 1930s airline of similar name see British Airways Ltd British Airways (LSE: BAY, NYSE: BAB) is the largest airline of the United Kingdom. ...

Two hundred twenty-four 224 = 2⁵·7, Harshad number

Two hundred twenty-five 225 = 3²·5² = 15², octagonal number, centered octagonal number, sum of the cubes of the first five integers, Harshad number An octagonal number is a figurate number that represents an octagon. ... A centered octagonal number is a centered figurate number that represents an octagon with a dot in the center and all other dots surrounding the center dot in successive octagonal layers. ...

Two hundred twenty-six 226 = 2·113, centered pentagonal number. A centered pentagonal number is a centered figurate number that represents a pentagon with a dot in the center and all other dots surrounding the center in successive pentagonal layers. ...

Two hundred twenty-seven 227 prime, safe prime, twin prime with 229, Chen prime, Eisenstein prime with no imaginary part, also the name of a TV show starring Marla Gibbs and Hal Williams A safe prime is a prime number of the form 2p + 1, where p is also a prime. ... A twin prime is a prime number that differs from another prime number by two. ... An Eisenstein prime is an Eisenstein integer aω + b that has only two Eisenstein divisors, the complex cube root of unity and aω + b itself. ... Marla Gibbs (born June 14, 1931 in Chicago, Illinois) is an American actress, most known for her role as the sarcastic maid, Florence Johnston, on The Jeffersons, as well as the starring role of Mary Jenkins in 227. ... Hal Williams (born December 14, 1938 in Columbus, Ohio) is an American actor, best known for his recurring role as the black cop Smitty on Sanford and Son, and as the patriarch Lester Jenkins on 227. ...

Two hundred twenty-eight 228 = 2²·3·19, sum of six consecutive primes (29 + 31 + 37 + 41 + 43 + 47), sum of ten consecutive primes (7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41), Harshad number

Two hundred twenty-nine 229 prime, twin prime with 227 A twin prime is a prime number that differs from another prime number by two. ...

230-239

Two hundred thirty 230 = 2·5·23, sphenic number, Harshad number, nontotient. Also, common voltage in the European Union. A sphenic number is a positive integer that is the product of three distinct prime factors. ... International danger high voltage symbol. ...

Two hundred thirty-one 231 = 3·7·11, sphenic number, triangular number, hexagonal number, octahedral number, Mertens function returns 0 A sphenic number is a positive integer that is the product of three distinct prime factors. ... A triangular number is a number that can be arranged in the shape of an equilateral triangle. ... A hexagonal number is a figurate number that represents a hexagon. ... An octahedral number is a figurate number that represents an octahedron, or two pyramids placed together, one upside-down underneath the other. ...

Two hundred thirty-two 232 = 2³·29, decagonal number, Mertens function returns 0, noncototient A decagonal number is a figurate number that represents a decagon. ...

Two hundred thirty-three 233 prime, Fibonacci number, Sophie Germain prime, Chen prime, Eisenstein prime with no imaginary part, Markov number, self number In mathematics, the Fibonacci numbers, named after Leonardo of Pisa, known as Fibonacci, form a sequence defined recursively by: In other words, each number is the sum of the two numbers before it. ... A prime number p is called a Sophie Germain prime if 2p + 1 is also prime. ... A Markov number or Markoff number is an integer x, y or z that is part of a solution to the Markov Diophantine equation The first few Markov numbers are 1, 2, 5, 13, 29, 34, 89, 169, 194, 233, 433, 610, 985, 1325, ... (sequence A002559 in OEIS) appearing in...

Two hundred thirty-four 234 = 2·3²·13, Harshad number, nontotient

Two hundred thirty-five 235 = 5·47, sum of three consecutive primes (73 + 79 + 83), Mertens function returns 0, Smarandache-Wellin number, centered triangular number In mathematics, Smarandache-Wellin numbers are special integers; the n-th Smarandache-Wellin number is defined as the concatenation of the first n prime numbers written in decimal notation. ... A centered triangular number is a centered figurate number that represents a triangle with a dot in the center and all other dots surrounding the center in successive triangular layers. ...

U-235 is the fissile isotope of uranium used in the first atomic bombs. Isotopes are forms of an element, therefore their nuclei have the same atomic number — the number of protons in the nucleus — but different mass numbers because they contain different numbers of neutrons. ... General Name, Symbol, Number uranium, U, 92 Chemical series actinides Group, Period, Block n/a, 7, f Appearance silvery gray metallic; corrodes to a spalling black oxide coat in air Atomic mass 238. ... The mushroom cloud of the atomic bombing of Nagasaki, Japan, in 1945 lifted nuclear fallout some 18km (60,000 feet) above the epicenter. ...

Two hundred thirty-six 236 = 2²·59, Mertens function returns 0, nontotient

Two hundred thirty-seven 237 = 3·79

Two hundred and thirty-eight 238 = 2·7·17, sphenic number, sum of the first thirteen primes, Mertens function returns 0, untouchable number. Also, the designation of United States Interstate 238, the only three-digit designated Interstate that is not a spur route of a larger Interstate. A sphenic number is a positive integer that is the product of three distinct prime factors. ... Interstate 238 (abbreviated I-238) is a short (2. ...

U-238 is the non-fissile isotope of uranium that is the heaviest isotope of any material available through extraction from minerals. Isotopes are forms of an element, therefore their nuclei have the same atomic number — the number of protons in the nucleus — but different mass numbers because they contain different numbers of neutrons. ...

Two hundred thirty-nine has its own article. 239 (two hundred [and] thirty-nine) is the natural number following 238 and preceding 240. ...

240-249

Two hundred forty 240 = 2⁴·3·5, sum of four consecutive primes (53 + 59 + 61 + 67), highly composite number, highly totient number, sum of eight consecutive primes (17 + 19 + 23 + 29 + 31 + 37 + 41 + 43), pronic number, Harshad number. Also, common voltage in England and Australia before conversion to 230V standard. In British currency, the number of pence in a pound until 1971. A cholesterol level of 240 and above is considered high risk. A highly composite number is a positive integer which has more divisors than any positive integer below it. ... A highly totient number k is an integer that has more solutions to the equation φ(x) = k, where φ is Eulers totient function, than any integer below it. ... International danger high voltage symbol. ... Royal motto (French): Dieu et mon droit (Translated: God and my right) Englands location (dark green) within the United Kingdom (light green), with the Republic of Ireland (blue) to its west Languages English Capital London Largest city London Area – Total Ranked 1st UK 130,395 km² Population – Total (mid... GBP redirects here. ...

Two hundred forty-one 241 regular prime, twin prime with 239 and a lucky prime. In mathematics, regular primes are a certain kind of prime numbers. ... A twin prime is a prime number that differs from another prime number by two. ... Headline text A lucky prime is a number that is a prime number and a lucky number. ...

Two hundred forty-two 242 = 2·11², nontotient

Two hundred forty-three 243 = 3⁵, sum of five consecutive primes (41 + 43 + 47 + 53 + 59), Harshad number

Two hundred forty-four 244 = 2²·61, nontotient, noncototient, self number

Two hundred forty-five 245 = 5·7². In the MARC format for records in online public access (library) catalogs, in which each type of information about a book (or other library material) is identified with a 3-digit number, 245 identifies the title of the item; most library catalog software requires that each record have at least a 245 tag, even if no other information is entered about the item. To meet Wikipedias quality standards, this article or section may require cleanup. ... An Online Public Access Catalog or OPAC is a computerized online catalog of the materials held in a library. ...

Two hundred forty-six 246 = 2·3·41, sphenic number, nontotient, untouchable number A sphenic number is a positive integer that is the product of three distinct prime factors. ...

Two hundred forty-seven 247 = 13·19, pentagonal number

Two hundred forty-eight 248 = 2³·31, nontotient, untouchable number, also area code for telephone calls in Oakland County and part of Macomb County in Michigan

Two hundred forty-nine 249 = 3·83

250-259

Two hundred fifty has its own article. 250 is the natural number following 249 and preceding 251. ...

Two hundred fifty-one 251 prime, Sophie Germain prime, sum of three consecutive primes (79 + 83 + 89), sum of seven consecutive primes (23 + 29 + 31 + 37 + 41 + 43 + 47), Chen prime, Eisenstein prime with no imaginary part. SMTP status code for user not local, mail will be forwarded

Two hundred fifty-two 252 = 2²·3²·7, Harshad number

Two hundred fifty-three 253 = 11·23, triangular number, star number, centered heptagonal number, centered nonagonal number A triangular number is a number that can be arranged in the shape of an equilateral triangle. ... A star number, or centered 12-gonal number, is a centered figurate number that represents a centered hexagram, such as the one that Chinese checkers are played on. ... A centered heptagonal number is a centered figurate number that represents a heptagon with a dot in the center and all other dots surrounding the center dot in successive heptagonal layers. ... A centered nonagonal number is a centered figurate number that represents a nonagon with a dot in the center and all other dots surrounding the center dot in successive nonagonal layers. ...

Two hundred fifty-four 254 = 2·127, Mertens function returns 0, nontotient

Two hundred fifty-five has its own article. 255 (two hundred [and] fifty-five, CCLV) is the natural number following 254 and preceding 256. ...

Two hundred and fifty-six has its own article. 256 (two hundred [and] fifty-six, CCLVI) is the natural number following 255 and preceding 257. ...

Two hundred fifty-seven 257 prime, Fermat prime, balanced prime, Chen prime, Eisenstein prime with no imaginary part In mathematics, a Fermat number, named after Pierre de Fermat who first studied them, is a positive integer of the form where n is a nonnegative integer. ... A balanced prime is a prime number that is equal to the arithmetic mean of the nearest prime above and below. ...

Two hundred fifty-eight 258 = 2·3·43, sphenic number, sum of four consecutive primes (59 + 61 + 67 + 71), nontotient A sphenic number is a positive integer that is the product of three distinct prime factors. ...

Two hundred fifty-nine 259 = 7·37

260-299

Two hundred sixty has its own article. 260 is the magic constant of nxn magic square and n-Queens Problem for n = 8, the size of an actual chess board. ...

Two hundred sixty-one 261 = 3²·29, nonagonal number, Harshad number

Two hundred sixty-two 262 = 2·131, meandric number, open meandric number, untouchable number In mathematics, a meander or closed meander is a self-avoiding closed curve which intersects a line a number of times. ... In mathematics, a meander or closed meander is a self-avoiding closed curve which intersects a line a number of times. ...

Two hundred sixty-three 263 prime, safe prime, sum of five consecutive primes (43 + 47 + 53 + 59 + 61), balanced prime, Chen prime, Eisenstein prime with no imaginary part, strictly non-palindromic number A balanced prime is a prime number that is equal to the arithmetic mean of the nearest prime above and below. ...

Two hundred sixty-four 264 = 2³·3·11, Harshad number

Two hundred sixty-five 265 = 5·53, Padovan number, centered square number, Smith number

Two hundred sixty-six 266 = 2·7·19, sphenic number, Harshad number, nontotient, noncototient, self number, repdigit in base 11 (222). A sphenic number is a positive integer that is the product of three distinct prime factors. ... In recreational mathematics, a repdigit is a natural number composed of repeated instances of the same digit, most often in the decimal numeral system. ...

Two hundred sixty-seven 267 = 3·89

Two hundred sixty-eight 268 = 2²·67, noncototient, untouchable number

Two hundred sixty-nine 269 prime, twin prime with 271, sum of three consecutive primes (83 + 89 + 97), Chen prime, Eisenstein prime with no imaginary part, highly cototient number, strictly non-palindromic number

Two hundred seventy 270 = 2·3³·5, harmonic divisor number, Harshad number, also the minimum number of votes to be chosen President of the United States by the U.S. Electoral College. A harmonic divisor number, or Ore number, is a number whose divisors, averaged in a harmonic mean, results in an integer. ... The presidential seal was used by President Hayes in 1880 and last modified in 1959 by adding the 50th star for Hawaii. ... The United States Electoral College is the electoral college that chooses the President and Vice President of the United States at the conclusion of each Presidential election. ...

Two hundred seventy-one 271 prime, twin prime with 269, cuban prime, centered hexagonal number A cuban prime is a prime number that is a solution to one of two different specific equations involving third powers of x and y. ... A centered hexagonal number, or hex number is a centered figurate number that represents a hexagon with a dot in the center and all other dots surrounding the center dot in successive hexagonal layers. ...

Two hundred seventy-two 272 = 2⁴·17, sum of four consecutive primes (61 + 67 + 71 + 73), Euler number, primitive semiperfect number, pronic number The Euler numbers are a sequence En of integers defined by the following Taylor series expansion: (Note that e, the base of the natural logarithm, is also occasionally called Eulers number, as is the Euler characteristic. ... In mathematics, a primitive semiperfect number (also called a primitive pseudoperfect number, irreducible semiperfect number or irreducible pseudoperfect number) is a natural number that has no semiperfect proper divisor. ...

Two hundred seventy-three has its own article. Two hundred seventy-three (273, CCLXXIII) is a natural number that comes after 272 and before 274. ...

Two hundred seventy-four 274 = 2·137, tribonacci number, Smith number, nontotient, noncototient, centered triangular number In mathematics, the Fibonacci numbers form a sequence defined recursively by: In words: you start with 0 and 1, and then produce the next Fibonacci number by adding the two previous Fibonacci numbers. ...

Two hundred seventy-five 275 = 5²·11. Also, spur routes of Interstate 75. Location of Interstate 75 Interstate 75 (abbreviated I-75) is an interstate highway in the midwest and southeastern United States. ...

Two hundred seventy-six 276 = 2²·3·23, triangular number, hexagonal number, centered pentagonal number, untouchable number A triangular number is a number that can be arranged in the shape of an equilateral triangle. ... A hexagonal number is a figurate number that represents a hexagon. ...

Two hundred seventy-seven 277 Perrin prime, Self prime In mathematics, the Perrin numbers are defined by the recurrence relation P(0) = 3, P(1) = 0, P(2) = 2, and P(n) = P(n − 2) + P(n − 3) for n > 2. ... In mathematics, a self prime is a self number that is prime. ...

Two hundred seventy-eight 278 = 2·139, nontotient

Two hundred seventy-nine 279 = 3²·31 Every positive integer is the sum of at most 279 eighth powers.

Two hundred eighty 280 = 2³·5·7, octagonal number, Harshad number

Two hundred and eighty-one 281 prime, twin prime with 283, Sophie Germain prime, sum of the first fourteen primes, sum of seven consecutive primes (29 + 31 + 37 + 41 + 43 + 47 + 53), Chen prime, Eisenstein prime with no imaginary part, centered decagonal number A twin prime is a prime number that differs from another prime number by two. ...

Two hundred eighty-two 282 = 2·3·47, sphenic number A sphenic number is a positive integer that is the product of three distinct prime factors. ...

Two hundred eighty-three 283 prime, twin prime with 281, strictly non-palindromic number A twin prime is a prime number that differs from another prime number by two. ...

Two hundred eighty-four 284 amicable number with 220; nontotient. 284 degrees Celsius is the flash point of paper. Amicable numbers are two numbers so related that the sum of the proper divisors of the one is equal to the other, unity being considered as a proper divisor but not the number itself. ... 220 (two hundred [and] twenty) is the natural number following 219 and preceding 221. ... A nontotient is a positive integer n which is not in the range of Eulers totient function φ, that is, for which φ(x) = n has no solution. ... A degree Celsius (°C) is a unit of temperature named after the Swedish astronomer Anders Celsius (1701-1744), who first proposed a similar system in 1742. ... The flash point of a flammable liquid is the lowest temperature at which it can form an ignitable mixture with air. ... Piece of paper Paper is a thin, flat material produced by the compression of fibers (or fibres). ...

Two hundred eighty-five 285 = 3·5·19, sphenic number, square pyramidal number, Harshad number, also in Star Trek, the total number of Rules of Acquisition. A sphenic number is a positive integer that is the product of three distinct prime factors. ... A pyramidal number, or square pyramidal number, is a figurate number that represents a pyramid with a base and four sides. ... Star Trek collectively refers to an American science-fiction franchise spanning six unique television series (which comprise 726 episodes) and ten feature films, in addition to hundreds of novels, computer and video games, fan stories, and other works of fiction — all of which are set within the same fictional universe... The Rules of Acquisition, in the fictional Star Trek universe, are a set of guidelines intended to ensure the profitability of businesses owned by the ultra-capitalist Ferengi. ...

Two hundred eighty-six 286 = 2·11·13, sphenic number, tetrahedral number, nontotient, also shorthand for the Intel 80286 microprocessor chip A sphenic number is a positive integer that is the product of three distinct prime factors. ... A pyramid with side length 5 contains 35 spheres. ... An Intel 80286 Microprocessor AMD 80286 with 12 Mhz. ...

Two hundred eighty-seven 287 = 7·41, sum of three consecutive primes (89 + 97 + 101), sum of five consecutive primes (47 + 53 + 59 + 61 + 67), sum of nine consecutive primes (17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47), Kynea number, pentagonal number, also shorthand for the Intel math coprocessor to the 80286 A Kynéa number (pronounced: Ka-Nay), named after Kynéa R. Griffith, is an integer of the form . ...

Two hundred eighty-eight 288 = 2⁵·3², pentagonal pyramidal number, 5 superfactorial, untouchable number, Harshad number, self number A pentagonal pyramidal number is a number equal to the sum of the first few pentagonal numbers. ... In mathematics, the factorial of a natural number n is the product of the positive integers less than or equal to n. ...

Two hundred eighty-nine 289 = 17², centered octagonal number, Friedman number since (8+9)^2=289 A centered octagonal number is a centered figurate number that represents an octagon with a dot in the center and all other dots surrounding the center dot in successive octagonal layers. ... A Friedman number is an integer which in a given base is the result of an expression using its own digits in combination with any of the four basic arithmetic operators (+, -, ×, ÷) and sometimes exponentiation. ...

Two hundred ninety 290 = 2·5·29, sphenic number, sum of four consecutive primes (67 + 71 + 73 + 79), nontotient, noncototient, untouchable number A sphenic number is a positive integer that is the product of three distinct prime factors. ...

Two hundred ninety-one 291 = 3·97

Two hundred ninety-two 292 = 2²·73, noncototient, untouchable number. The continued fraction representation of pi is [3; 7, 15, 1, 292, 1, 1, 1, 2...]; the convergent obtained by truncating before the surprisingly large term 292 yields the excellent rational approximation 355/113 to pi. In mathematics, a continued fraction is an expression such as where a0 is some integer and all the other numbers an are positive integers. ... Lower-case Ï€ (the lower case letter is usually used for the constant) The mathematical constant Ï€ is an irrational number, approximately equal to 3. ...

Two hundred ninety-three 293 prime, Sophie Germain prime, Chen prime, Eisenstein prime with no imaginary part, strictly non-palindromic number

Two hundred ninety-four 294 = 2·3·7²

Two hundred ninety-five 295 = 5·59, also, the numerical designation of seven spur routes of Interstate 95 Map Interstate 95 (abbreviated I-95) is an Interstate Highway that runs 1,927 miles (3,101 kilometers) north-south along the east coast of the United States. ...

Two hundred ninety-six 296 = 2³·37

Two hundred ninety-seven 297 = 3³·11, decagonal number, Kaprekar number In mathematics, a Kaprekar number is a number that, in a given base, when squared, can be split into two numbers with the same number of digits as the original number which add up to the original number again. ...

Two hundred ninety-eight 298 = 2·149, nontotient, noncototient

Two hundred and ninety-nine 299 = 13·23, highly cototient number, self number