43 (forty-three) is the natural number following 42 and preceding 44. In mathematics, a natural number can mean either an element of the set {1, 2, 3, ...} (i. ... Look up forty-two in Wiktionary, the free dictionary. ... 44 (forty-four) is the natural number following 43 and preceding 45. ...

Aleph-0, the smallest infinite cardinal In mathematics, cardinal numbers, or cardinals for short, are a generalized kind of number used to denote the size of a set, known as its cardinality. ... In set theory, ordinal, ordinal number, and transfinite ordinal number refer to a type of number introduced by Georg Cantor in 1897, to accommodate infinite sequences and to classify sets with certain kinds of order structures on them. ... ... In mathematics, a divisor of an integer n, also called a factor of n, is an integer which evenly divides n without leaving a remainder. ... The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ... The binary numeral system, or base-2 number system, is a numeral system that represents numeric values using two symbols, usually 0 and 1. ... In mathematics and computer science, hexadecimal, base-16, 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. ...

In mathematics

Forty-three is the 14th smallest prime number. The previous is forty-one, with which it comprises a twin prime, and the next is forty-seven. 43 is the smallest prime that is not a Chen prime. It is also the third Wagstaff prime. In mathematics, a prime number (or a prime) is a natural number which has exactly two distinct natural number divisors: 1 and itself. ... 41 is the natural number following 40 and preceding 42. ... A twin prime is a prime number that differs from another prime number by two. ... 47 (forty-seven) is the natural number following 46 and preceding 48. ... A prime number p is called a Chen prime if p + 2 is either a prime or a product of two primes. ... In mathematics, a prime number of the form (2p + 1) / 3 for a prime number p is called a Wagstaff prime; they are related to the New Mersenne conjecture. ...

43 is the fourth term of Sylvester's sequence, one more than the product of the previous terms (2 × 3 × 7). Sylvesters sequence consists of the coprime denominators of an Egyptian fraction that adds up to 1. ...

43 is a centered heptagonal number. 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. ...

Let a(0) = a(1) = 1, and thenceforth a(n) = (a(0)² + a(1)² + ... + a(n-1)²) / (n-1). This sequence continues 1 1 2 3 5 10 28 154... (sequence A003504 in OEIS). Amazingly, a(43) is the first term of this sequence that is not an integer. The On-Line Encyclopedia of Integer Sequences (OEIS) is an extensive searchable database of integer sequences, freely available on the Web. ... The integers are commonly denoted by the above symbol. ...

43 is a Heegner number. In number theory, a Heegner number is a positive integer n such that the quadratic field Q(√-n) has class number 1. ...

43 is a repdigit in base 6 (111). In recreational mathematics, a repdigit is a natural number composed of repeated instances of the same digit, most often in the decimal numeral system. ...

43 is the largest natural number that is not an (original) McNugget number. In recreational mathematics, the McNugget numbers are an example of a set of numbers obtained by linear combination of a fixed set of other numbers, similar to the numbers involved in the coin problem. ...

This is the smallest number, which draws up as sum of 2,3,4,5 different primes: 43=41+2 43=11+13+19 43=2+11+13+17 43=3+5+7+11+17. The following date magic square illustrates the magic constant as the sum of four primes: A date magic square is a 4×4 magic square in which the numbers in a given date (for example 22-10-1887) are used to construct the first row (22, 10, 18, 87). ... The magic constant of a magic square, an n-by-n matrix, is defined such that the sum of any row, column or main diagonal yields the same result, denoted M2(n). ...

In science

• The chemical element with the atomic number 43 is technetium. It has the lowest atomic number of any element that does not possess stable isotopes.

See also: List of elements by atomic number In chemistry and physics, the atomic number (also known as the proton number) is the number of protons found in the nucleus of an atom. ... General Name, Symbol, Number technetium, Tc, 43 Chemical series transition metals Group, Period, Block 7, 5, d Appearance silvery gray metal Standard atomic weight [98](0) g·mol−1 Electron configuration [Kr] 4d5 5s2 Electrons per shell 2, 8, 18, 13, 2 Physical properties Phase solid Density (near r. ... Stable isotopes are chemical isotopes that are not radioactive. ...

Astronomy

• Messier object M43, a magnitude 7.0 H II region in the constellation of Orion, a part of the Orion Nebula, and also sometimes known as de Mairan's Nebula

• The New General Catalogue object NGC 43, a barred spiral galaxy in the constellation Andromeda

• The Saros number of the solar eclipse series which began on April 29, 1513 BC and ended on June 5, 233 BC . The duration of Saros series 43 was 1280.1 years, and it contained 72 solar eclipses.

• The Saros number of the lunar eclipse series which began on August 27, 1482 BC and ended on March 15, 70. The duration of Saros series 43 was 1550.5 years, and it contained 87 lunar eclipses.

The Messier objects are a set of astronomical objects catalogued by Charles Messier in his catalogue of Nebulae and Star Clusters first published in 1774. ... De Mairans Nebula (also known as M43 and NGC 1982) is an H II region in the Orion constellation. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... NGC 604, a giant H II region in the Triangulum Galaxy. ... This article is about the star grouping. ... Orion (IPA: ), a constellation often referred to as The Hunter, is a prominent constellation, one of the largest and perhaps the best-known and most conspicuous in the sky[1]. Its brilliant stars are found on the celestial equator and are visible throughout the world, making this constellation globally recognized. ... The Orion Nebula (also known as Messier 42, M42, or NGC 1976) is a diffuse nebula situated south of Orions Belt. ... The New General Catalogue (NGC) is the most well-known catalogue of deep sky objects in amateur astronomy. ... NGC 1300, viewed nearly face-on. ... Andromeda (IPA: ) is a constellation named for the princess Andromeda (which is Greek for Ruler over men), a character in Greek mythology. ... A Saros cycle is a period of 6585 + 1/3 days (approximately 18 years 10 days and 8 hours) which can be used to predict eclipses of the sun and the moon. ... Photo taken during the 1999 eclipse. ... is the 119th day of the year (120th in leap years) in the Gregorian calendar. ... (Redirected from 1513 BC) Centuries: 17th century BC - 16th century BC - 15th century BC Decades: 1560s BC 1550s BC 1540s BC 1530s BC 1520s BC - 1510s BC - 1500s BC 1490s BC 1480s BC 1470s BC 1460s BC Events and Trends 1512 BC (approx. ... is the 156th day of the year (157th in leap years) in the Gregorian calendar. ... Centuries: 4th century BC - 3rd century BC - 2nd century BC Decades: 280s BC 270s BC 260s BC 250s BC 240s BC - 230s BC - 220s BC 210s BC 200s BC 190s BC 180s BC Years: 238 BC 237 BC 236 BC 235 BC 234 BC - 233 BC - 232 BC 231 BC... Time lapse movie of the 3 March 2007 lunar eclipse A lunar eclipse occurs whenever the Moon passes through some portion of the Earth’s shadow. ... is the 239th day of the year (240th in leap years) in the Gregorian calendar. ... (Redirected from 1482 BC) Centuries: 16th century BC - 15th century BC - 14th century BC Decades: 1530s BC 1520s BC 1510s BC 1500s BC 1490s BC - 1480s BC - 1470s BC 1460s BC 1450s BC 1440s BC 1430s BC Events and Trends 1487 BC - Amphictyon, son of Deucalion and Pyrrha and legendary... is the 74th day of the year (75th in leap years) in the Gregorian calendar. ... This article is about the year 70. ...

In sports

In professional sports in the United States, the jersey number 43 has been retired for Jim Norton of Tennessee (NFL) and Dennis Eckersley of the Oakland Athletics. Jim Norton (born 1938) was an American college and professional football player. ... City Nashville, Tennessee Team colors Navy, Titan Blue, White, and Red Head Coach Jeff Fisher Owner Bud Adams General manager Mike Reinfeldt Mascot T-Rac League/Conference affiliations American Football League (1960–1969) Eastern Division (1960–1969) National Football League (1970–present) American Football Conference (1970–present) AFC Central (1970... Dennis Lee Eckersley (born October 3, 1954 in Oakland, California), nicknamed Eck, was a Major League Baseball player elected to Baseball Hall of Fame in 2004 (his first year of eligibility). ... Major league affiliations American League (1901–present) West Division (1969–present) Current uniform Retired Numbers 9, 27, 34, 42, 43, (As) Name Oakland Athletics (1968–present) Kansas City Athletics (1955-1967) Philadelphia Athletics (1901-1954) (Referred to as As) Other nicknames The As, The White Elephants, The...

• The number for Richard Petty's NASCAR race car when he won his 7 Winston Cup Championships. He also won 200 races in his career, 95% of them in the famous #43.
• The number worn by Derby County Goalkeeper Stephen Bywater in memory of his ex-goalkeeping coach Les Sealey who died at the age of 43 in 2001.

Mad Magazine created the game 43-Man Squamish. Richard Lee Petty (born July 2, 1937) is an American former NASCAR Winston Cup Series driver. ... Jeff Burton (99), Elliott Sadler (38), Ricky Rudd (21), Dale Jarrett (88), Sterling Marlin (40), Jimmie Johnson (48), and Casey Mears (41) practice for the 2004 Daytona 500 The National Association for Stock Car Auto Racing (NASCAR) is the largest sanctioning body of motorsports in the United States. ... The National Association for Stock Car Auto Racing (NASCAR) is the largest sanctioning body of motorsports in the United States. ... Derby County F.C. is an English football club, currently playing in the Football League Championship. ... A football goalkeeper leaves the ground to parry a shot on goal In many team sports, a goalkeeper (termed goaltender, netminder, goalie, or keeper in some sports) is a designated player that is charged with directly preventing the opposite team from scoring by defending the goal. ... Stephen Michael Bywater[1], (born June 7, 1981 in Manchester), is an English football player who plays as a goalkeeper for Derby County. ... Les Sealey (29 September 1957 – 19 August 2001) was an English football goalkeeper who played for Coventry City, Luton Town, Manchester United, Aston Villa and West Ham and others. ... Year 2001 (MMI) was a common year starting on Monday (link displays the 2001 Gregorian calendar). ... Harvey Kurtzmans cover for the first issue of the comic book Mad Mad is an American humor magazine founded by publisher William Gaines and editor Harvey Kurtzman in 1952. ... 43-Man Squamish as it appeared in MAD Magazine in 1965 43-Man Squamish is a fictional sport that was invented in Issue #95 of MAD Magazine (June 1965) by George Woodbridge and Tom Koch. ...

• The number of consecutive district titles trying to be won by St. Francis de Sales of Toledo Ohio (a national record in any high school sport).

In other fields

Forty-three is:

• The designation of Interstate 43, a freeway in Wisconsin.
• The code for direct dial international phone calls to Austria.
• The number 43 has been adopted by the online community as a representation of organization: 43things.com, 43folders.com.
• The number of different herbs and spices contained in the Spanish liqueur Licor 43.
• The album Dark Side of the Moon by Pink Floyd is exactly 43 minutes long.

Wikimedia Commons has media related to: Interstate 43 Interstate 43 (abbreviated I-43) is an intrastate interstate highway located entirely within the state of Wisconsin, United States. ... Official language(s) None Capital Madison Largest city Milwaukee Largest metro area Greater Milwaukee Area  Ranked 23rd  - Total 65,498 sq mi (169,790 km²)  - Width 260 miles (420 km)  - Length 310 miles (500 km)  - % water 17  - Latitude 42° 30′ N to 47° 05′ N  - Longitude 86° 46′ W to... 43 Things or 43things. ... Licor 43, or Cuarenta Y Tres (Spanish for 43), is a bright yellow Spanish liqueur. ... This article is about the Pink Floyd album. ... Pink Floyd are an English rock band that initially earned recognition for their psychedelic rock music, and, as they evolved, for their progressive rock music. ...

Historical years

43 A.D., 43 B.C., 1943, 2043, etc. Events Aulus Plautius, with 4 legions, landed on Britain. ... Centuries: 2nd century BC - 1st century BC - 1st century Decades: 90s BC 80s BC 70s BC 60s BC 50s BC - 40s BC - 30s BC 20s BC 10s BC 0s BC 0s Years: 48 BC 47 BC 46 BC 45 BC 44 BC 43 BC 42 BC 41 BC 40 BC... Year 1943 (MCMXLIII) was a common year starting on Friday (the link will display full 1943 calendar) of the Gregorian calendar. ... Centuries: 20th century - 21st century - 22nd century Decades: 1990s 2000s 2010s 2020s 2030s - 2040s - 2050s 2060s 2070s 2080s 2090s Years: 2038 2039 2040 2041 2042 - 2043 - 2044 2045 2046 2047 2048 2043 (MMXLIII)[link title January Excepted expiration from the Arizona-Sonora pipline communication. ...