25 (twenty-five) is the natural number following 24 and preceding 26. 20 (twenty) is the natural number following 19 and preceding 21. ... Look up five in Wiktionary, the free dictionary. ... In mathematics, a natural number can mean either an element of the set {1, 2, 3, ...} (i. ... 24 (twenty-four) is the natural number following 23 and preceding 25. ... 26 (twenty-six) is the natural number following 25 and preceding 27. ...

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. ... 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. ... 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

It is a square number, being 5² = 5 × 5, and it is also the sum of two squares, 3² + 4², often used in demonstrations of the Pythagorean theorem. It is the smallest square that is also a sum of two squares. 25 is a centered octagonal number and an automorphic number. In mathematics, a square number, sometimes also called a perfect square, is an integer that can be written as the square of some other integer. ... Look up five in Wiktionary, the free dictionary. ... In mathematics, the Pythagorean theorem or Pythagoras theorem is a relation in Euclidean geometry among the three sides of a right triangle. ... 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. ... In mathematics an automorphic number (sometimes referred to as a circular number) is a number whose square ends in the number itself. ...

It is the smallest base 10 Friedman number as it can be expressed by its own numbers: 5². Decimal, or denary, notation is the most common way of writing the base 10 numeral system, which uses various symbols for ten distinct quantities (0, 1, 2, 3, 4, 5, 6, 7, 8 and 9, called digits) together with the decimal point and the sign symbols + (plus) and − (minus... A Friedman number is an integer which, in a given base, is the result of an expression using all its own digits in combination with any of the four basic arithmetic operators (+, -, ×, ÷) and sometimes exponentiation. ...

It is also a Cullen number. 25 is the smallest pseudoprime satisfying the congruence 7ⁿ = 7 mod n. It is also a Somer pseudoprime based on 6. In mathematics, a Cullen number is a natural number of the form n · 2n + 1 (written Cn). ... A pseudoprime is a probable prime (an integer which shares a property common to all prime numbers) which is not actually prime. ... A Somer pseudoprime is an odd composite number based on another number. ...

25 is the smallest aspiring number — a composite non-sociable number whose aliquot sequence does not terminate. In mathematics, an aliquot sequence is a recursive sequence in which each term is the sum of the proper divisors of the previous term. ... Sociable numbers are generalizations of the concepts of amicable numbers and perfect numbers. ... In mathematics, an aliquot sequence is a recursive sequence which can be defined in the following way: if we write σ(n) = σ1(n) to be the divisor function normally, then, the aliquot sequence of k can be written: s0 = k sn = σ(sn−1) − sn−1 For example, the aliquot sequence...

Within base 10 one can readily test for divisibility by 25 by seeing if the last two digits of the number match 25, 50, 75 or 00.

In science

• The atomic number of manganese

It has been suggested that List of elements by atomic number be merged into this article or section. ... General Name, Symbol, Number manganese, Mn, 25 Chemical series transition metals Group, Period, Block 7, 4, d Appearance silvery metallic Atomic mass 54. ...

Astronomy

• Messier object M25, a magnitude 4.9 open cluster in the constellation Sagittarius

• The New General Catalogue object NGC 25, a magnitude 11.9 barred spiral galaxy in the constellation Phoenix

• The Saros number of the solar eclipse series which began on -2051 April 19 and ended on -771 May 26. The duration of Saros series 25 was 1280.1 years, and it contained 72 solar eclipses.

• The Saros number of the lunar eclipse series which began on -2038 August 6 and ended on -469 March 5. The duration of Saros series 25 was 1568.6 years, and it contained 88 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. ... Open Cluster M25 (also known as Messier Object 25 or IC 4725) is an open cluster in the constellation Sagittarius. ... 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. ... The Pleiades is one of the most famous open clusters. ... This article or section does not cite its references or sources. ... For other uses, see Sagittarius. ... The New General Catalogue (NGC) is the most well-known catalogue of deep sky objects in amateur astronomy. ... NGC 1300, viewed nearly face-on. ... Phoenix (IPA: ) is a minor southern constellation, introduced by Dutch navigators Pieter Dirkszoon Keyser and Frederick de Houtman, and popularized by Johann Bayers Uranometria in 1603. ... 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. ... April 19 is the 109th day of the year in the Gregorian calendar (110th in leap years). ... May 26 is the 146th day of the year in the Gregorian calendar (147th in leap years). ... A lunar eclipse occurs whenever the Moon passes through some portion of the Earths shadow. ... August 6 is the 218th day of the year in the Gregorian Calendar (219th in leap years), with 147 days remaining. ... March 5 is the 64th day of the year in the Gregorian Calendar (65th in leap years). ...

In other fields

Twenty five is:

• The number of years of marriage marked in a silver wedding anniversary.
• The minimum age of candidates for election to the United States House of Representatives. "Under 25" provides a common cut-off point for designating youth.
• The number of cents in a quarter, an American coin with George Washington's portrait on the obverse and an eagle on the reverse (or special reverses for the special state quarters since 1999), and a Canadian coin with Queen Elizabeth II on the obverse and a caribou on the reverse (or special reverses lately).
• The usual TCP port for SMTP.
• The designation of United States Interstate 25, a freeway that runs from New Mexico to Wyoming.
• The designation of the M25 London Orbital motorway.
• The (critical) number of Florida electoral votes for the 2000 U.S. presidential election.
• The 'lucky number' of King Stephen of Willoughby.
• The name of the national card game of Ireland. Twenty five is played widely in rural pubs and at home. The game moves quite quickly - it does not take long to play a hand - and although there is a fair amount of luck in it, there is also some scope for skill. It is played by four people. The ranking order of the cards may seem a little arcane at first, but with a little practice it becomes second nature. Apart from the scoring it is more or less the same as the old games of Maw and Spoil Five.
• In Pokémon, the Pokédex I.D. number of Pikachu.
• The speed limit in Nutbush, Tennessee, according to Tina Turner's song Nutbush City Limits.
• "25", a song by Veruca Salt from their 1994 album American Thighs
• In Sweden, the minimum age to be sterilized
• The new raid size in World of Warcraft expansion, World of Warcraft: The Burning Crusade.
• TwentyFive is the name of the new George Michael compilation celebrating 25 years in the music business (1981-2006)

Shirt number for Football of Narrabunda Wundurra "that damn small hawk" who plays for TS Eagle Ranges. It has been suggested that this article or section be merged into Anniversary. ... Seal of the House of Representatives The United States House of Representatives (or simply the House) is one of the two chambers of the United States Congress, the other being the Senate. ... Youth is defined by Websters New World Dictionary as, The time of life when one is young; especially: a: the period between childhood and maturity b: the early period of existence, growth, or development. ... George Washington (February 22, 1732 – December 14, 1799)[1] led Americas Continental Army to victory over Britain in the American Revolutionary War (1775–1783), and was later elected the first president of the United States under the U.S. Constitution. ... Elizabeth II (Elizabeth Alexandra Mary Windsor; born 21 April 1926) is Queen of sixteen sovereign states, holding each crown and title equally. ... The Transmission Control Protocol (TCP) is one of the core protocols of the Internet protocol suite, often simply referred to as TCP/IP. Using TCP, applications on networked hosts can create connections to one another, over which they can exchange streams of data using Stream Sockets. ... Simple Mail Transfer Protocol (SMTP) is the de facto standard for email transmission across the Internet. ... Interstate 25 (abbreviated I-25) is an interstate highway in the western United States. ... Capital Santa Fe Largest city Albuquerque Area  Ranked 5th  - Total 121,665 sq mi (315,194 km²)  - Width 342 miles (550 km)  - Length 370 miles (595 km)  - % water 0. ... Official language(s) English Capital Cheyenne Largest city Cheyenne Area  Ranked 10th  - Total 97,818 sq mi (253,348 km²)  - Width 280 miles (450 km)  - Length 360 miles (580 km)  - % water 0. ... The M25 motorway looking south between junctions 14 and 15, near Heathrow Airport. ... This article is about the capital of England and the United Kingdom. ... Official language(s) English Capital Tallahassee Largest city Jacksonville Largest metro area Miami Area  Ranked 22nd  - Total 65,795[1] sq mi (170,304[1] km²)  - Width 361 miles (582 km)  - Length 447 miles (721 km)  - % water 17. ... Presidential electoral votes by state. ... The word maw originally meant stomach. ... Spoil-Five is an old game of cards, probably imported from Ireland, where it is still very popular, though the original name, according to The Compleat Gamester, was Five-cards. ... The official Pokémon logo. ... Pikachu ) are one of the 493 fictional species of Pokémon creatures from the multi-billion-dollar[1] Pokémon media franchise—a collection of video games, anime, manga, books, trading cards, and other media created by Satoshi Tajiri. ... Grocery store in Nutbush Nutbush, Tennessee is an unincorporated rural community in western Tennessee that has been considered part of Brownsville, in Haywood County, and Ripley in Lauderdale County, United States. ... Tina Turner (born Anna Mae Bullock on November 26, 1939) is an eight-time Grammy Award-winning American pop/rock singer and actress. ... Nutbush City Limits is Tina Turners semi-autobiographical rock song which continues to sound fresh and vibrant some thirty years after it was recorded. ... American Thighs is the debut album by alternative rock band Veruca Salt. ... Twentyfive or 25 is George Michaels latest greatest hits album, which celebrates the 25th anniversary of his music career. ... Γιώργος-Κυριάκος Παναγιώτου (English: Georgios Kyriacos Panayiotou), better known as George Michael (born on June 25, 1963) is a British singer-songwriter and pop star[1] who performs soul influenced pop, and who (as a solo artist and half of the duo WHAM!) has enjoyed global success since 1982. ...

• "25 boy", in Cantonese Chinese, is a slang term meaning "traitor" as used in the Chinese movie Over The Edge.

In sports

• The size of the full roster on a major league baseball team
• Jersey # of NFL player Reggie Bush of the New Orleans Saints.
• Number of Nextel Cup Driver Casey Mears.
• Chelsea F.C. have not assigned the squad number 25 to any player since Gianfranco Zola wore the shirt till 2003.

This article or section does not adequately cite its references or sources. ... Reginald Alfred “Reggie” Bush II (born March 2, 1985 in San Diego, California),He was nicknamed “The President,” alluding to President Bush, is an American football player who plays for the New Orleans Saints and formerly for the University of Southern California (USC) Trojans. ... City New Orleans, Louisiana Team colors Old Gold, Black, and White Head Coach Sean Payton Owner Tom Benson General manager Mickey Loomis Mascot Gumbo League/Conference affiliations National Football League (1967–present) Eastern Conference (1967-1969) Capitol Division (1967; 1969) Century Division (1968) National Football Conference (1970-present) NFC West... Casey Mears (born March 12, 1978 in Bakersfield, California) is the driver of the #42 Texaco/Havoline Dodge in the NASCAR Nextel Cup Series for Chip Ganassi Racing with Felix Sabates. ... Chelsea Football Club (also known as the Blues, previously known as the Pensioners), founded in 1905, is a Premier League football team that plays at Stamford Bridge football ground in South west London. ... Gianfranco Zola, OBE, born July 5, 1966 in Oliena, Sardinia, is a retired Italian footballer. ...

Historical years

25 A.D., 25 B.C., 1925, 2025, etc. Events Han dynasty was restored in China as Liu Xiu proclaimed himself emperor, start of jiangwu era (->56). ... Centuries: 2nd century BC - 1st century BC - 1st century Decades: 70s BC 60s BC 50s BC 40s BC 30s BC - 20s BC - 10s BC 0s 10s 20s 30s Years: 30 BC 29 BC 28 BC 27 BC 26 BC 25 BC 24 BC 23 BC 22 BC 21 BC 20... 1925 (MCMXXV) was a common year starting on Thursday (link will display the full calendar). ... 2025 (MMXXV) will be a common year starting on Tuesday in the Gregorian Calendar. ...