23 (twenty-three) is the natural number following 22 and preceding 24. Aleph-0, the smallest infinite cardinal In mathematics, cardinal numbers, or cardinals for short, are generalized numbers used to measure the cardinality (size) of sets. ... In linguistics, ordinal numbers are the words representing the rank of a number with respect to some order, in particular order or position (i. ... ... In mathematics, a prime number (or a prime) is a natural number greater than 1 which has exactly two distinct natural number divisors: 1 and itself. ... 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. ... The octal numeral system, or oct for short, is the base-8 number system, and uses the digits 0 to 7. ... The duodecimal (also known as base-12 or dozenal) system is a numeral system using twelve as its base. ... 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, a natural number can mean either an element of the set {1, 2, 3, ...} (i. ... 22 (twenty-two) is the natural number following 21 and preceding 23. ... 24 (twenty-four) is the natural number following 23 and preceding 25. ...

In mathematics

Twenty-three is the ninth prime number, the smallest odd prime which is not a twin prime. Twenty-three is also the fifth factorial prime, the second Woodall prime. It is an Eisenstein prime with no imaginary part and real part of the form 3n − 1. In mathematics, a prime number (or a prime) is a natural number greater than 1 which has exactly two distinct natural number divisors: 1 and itself. ... A twin prime is a prime number that differs from another prime number by two. ... A factorial prime is a number that is one less or one more than a factorial and is also a prime number. ... In mathematics, a Woodall number or Riesel number is a natural number of the form n · 2n − 1 (written Wn). ... 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. ...

The fifth Sophie Germain prime and the fourth safe prime, 23 is the next to last member of the first Cunningham chain of the first kind to have five terms (2, 5, 11, 23, 47). Since 14 + 1 is a multiple of 23 but 23 is not one more than a multiple 14, 23 is a Pillai prime. 23 is the smallest odd prime to be a highly cototient number, as the solution to x - φ(x) for the integers 95, 119, 143, 529. A prime number p is called a Sophie Germain prime if 2p + 1 is also prime. ... A safe prime is a prime number of the form 2p + 1, where p is also a prime. ... In mathematics, a Cunningham chain is a certain sequence of prime numbers. ... A Pillai prime is a prime number p for which there is an integer n > 0 such that the factorial of n is one less than a multiple of the prime, but the prime is not one more than a multiple of n. ... 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. ...

23 is the first prime P for which unique factorization of cyclotomic integers based on the P'th root of unity breaks down. The sum of the first 23 primes is 874, which is divisible by 23, a property shared by few other numbers.^[1][2]

In the list of Fortunate numbers, 23 occurs twice, since adding 23 to either the fifth or eighth primorial gives a prime number (namely 2333 and 9699713). A Fortunate number for a given positive integer n is the smallest integer m > 1 such that the product of the first n prime numbers (the primorial of n) plus m gives another prime number. ... For n ≥ 2, the primorial n# is the product of all prime numbers less than or equal to n. ...

23 also has the distinction of being one of two integers that cannot be expressed as the sum of fewer than 9 cubes of integers (the other is 239). See Waring's problem. 239 (two hundred [and] thirty-nine) is the natural number following 238 and preceding 240. ... In number theory, Warings problem, proposed in 1770 by Edward Waring, asks whether for every natural number k there exists an associated positive integer s such that every natural number is the sum of at most s kth powers of natural numbers. ...

23 is a Wedderburn-Etherington number. The codewords in the perfect (non-extended) binary Golay code are of size 23. 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. ... In mathematics and computer science, a binary Golay code is a type of error-correcting code used in digital communications. ...

According to the birthday paradox, in a group of 23 (or more) randomly chosen people, the probability is more than 50% that some pair of them will have the same birthday. In probability theory, the birthday paradox states that in a group of 23 (or more) randomly chosen people, there is more than 50% probability that some pair of them will have the same birthday. ...

There were 23 problems on David Hilbert's famous list of unsolved mathematical problems, presented to the International Congress of Mathematicians in Paris in 1900. | name = David Hilbert | image = Hilbert1912. ... The International Congress of Mathematicians (ICM) is the biggest congress in mathematics. ...

In base 10, 23 is the second Smarandache-Wellin prime, as it is the concatenation of the base 10 representations of the first two primes (2 and 3) and is itself also prime. It is also a happy number in base 10. 23! is 23 digits long in base 10. There are only three other numbers that have this property: 1, 22, and 24. 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 happy number is defined by the following process. ... For factorial rings in mathematics, see unique factorisation domain. ...

The natural logarithms of all positive integers lower than 23 are known to have binary BBP-type formulae^[3]. In mathematics, the Bailey-Borwein-Plouffe formula (BBP formula) is a π summation formula discovered in 1995 by Simon Plouffe. ...

In science

• The atomic number of vanadium and the approximate atomic mass (in u) of sodium.
• Human sex cells have 23 chromosomes. Other human cells have 46 chromosomes, arranged in pairs.
• The earth tilts at an axis of 23.5 degrees.
• It takes blood 23 seconds to flow through the human body.
• The human brain contains roughly 23 billion neurons, each linked to as many as 10,000 other neurons.

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 vanadium, V, 23 Chemical series transition metals Group, period, block 5, 4, d Appearance silver-grey metal Standard atomic weight 50. ... Stylized lithium-7 atom: 3 protons, 4 neutrons & 3 electrons (~1800 times smaller than protons/neutrons). ... The atomic mass unit (amu), unified atomic mass unit (u), or dalton (Da), is a small unit of mass used to express atomic masses and molecular masses. ... For sodium in the diet, see Salt. ... Gametes (in Greek: γαμέτες) —also known as sex cells, germ cells, or spores—are the specialized cells that come together during fertilization (conception) in organisms that reproduce sexually. ... For information about chromosomes in genetic algorithms, see chromosome (genetic algorithm). ...

In technology

23 is the TCP/IP port used for telnet and is the default for the telnet command. The Internet protocol suite is the set of communications protocols that implement the protocol stack on which the Internet runs. ... For the packet switched network, see Telenet. ...

In religion

• Psalm 23, also known as the Shepherd Psalm, is possibly the most quoted and best known Psalm. Psalms is also the 23rd book in the Douay Catholic Bible.
• In Islam, the Qur'an was revealed in a total of 23 years to Muhammad.^[4][5]
• In Abhidharma, the number of anomalous generic types (of a possible 72) - e.g., events are considered sui generis because they are not reducible to either mind or matter - is 23.
• Principia Discordia, the sacred text of Discordianism, holds that 23 (along with 5) is the sacred number of Eris, goddess of discord.

The theme of the 23rd Psalm in the Bible casts God in the role of protector and provider. ... The Qur’ān [1] (Arabic: , literally the recitation; also sometimes transliterated as Quran, Koran, or Al-Quran) is the central religious text of Islam. ... The abhidhamma is the name of one of the three pitakas, or baskets of tradition, into which the Tipitaka (Pali; Sanskrit: Tripitaka), the canon of early Buddhism, is divided. ... The Loompanics Yellow Cover combined 4th & 5th Edition Principia Discordia, (1979). ... Discordianism is a modern religion centered on the idea that chaos is as important as order. ... Look up five in Wiktionary, the free dictionary. ... Eris (ca. ...

In sports

Michael Jordan, a star basketball player for the NBA, wore the number 23 on his jersey.

• Michael Jordan wore number 23, with the exception of a short period of time, when he played professional basketball with the Chicago Bulls and, later, the Washington Wizards.
• Don Mattingly of the New York Yankees wore number 23. The New York Yankees retired the number in 1997.
• Ryne Sandberg, of the Chicago Cubs, wore number 23. His number was retired on August 28, 2005.
• Bob Nystrom of the New York Islanders wore number 23 and has had the number retired in his honour.
• Manchester City F.C. have not assigned the squad number 23 to any player since 2003. This is because Marc-Vivien Foé, the player who collapsed and died while playing for Cameroon on June 26, 2003, had held this squad number at Manchester City.
• 23 is the highest number in Football World Cup squads.
• David Beckham wore 23 for Real Madrid which he chose because of Michael Jordan's wearing of the number. Also he chose this number as it is a prime number, as was 7 (his previous shirt number). He continues to wear it at his new club, L.A. Galaxy.
• Australian cricketers Michael Clarke and Shane Warne wear the number 23.
• Pete Maravich wore 23 in college at Louisiana State University.
• Andrew Mcleod of the Adelaide Crows wears number 23.

Image File history File linksMetadata No higher resolution available. ... Image File history File linksMetadata No higher resolution available. ... For other persons named Michael Jordan, see Michael Jordan (disambiguation). ... For other persons named Michael Jordan, see Michael Jordan (disambiguation). ... This article is about people called professionals. ... This article is about the sport. ... This article is about the professional basketball team. ... Washington Bullets redirects here. ... Donald Arthur Mattingly (nicknamed Donnie Baseball and The Hit Man) (born April 20, 1961) is a retired first baseman who played for the New York Yankees of the American League from 1982-1995. ... Major league affiliations American League (1901–present) East Division (1969–present) Current uniform Retired Numbers 1, 3, 4, 5, 7, 8, 8, 9, 10, 15, 16, 23, 32, 37, 44, 49 Name New York Yankees (1913–present) New York Highlanders (1903-1912) Baltimore Orioles (1901-1902) (Also referred to as... Major league affiliations American League (1901–present) East Division (1969–present) Current uniform Retired Numbers 1, 3, 4, 5, 7, 8, 8, 9, 10, 15, 16, 23, 32, 37, 44, 49 Name New York Yankees (1913–present) New York Highlanders (1903-1912) Baltimore Orioles (1901-1902) (Also referred to as... Ryne Dee Sandberg (born September 18, 1959 in Spokane, Washington), nicknamed Ryno, is a former second baseman in Major League Baseball who spent nearly his entire career with the Chicago Cubs. ... Major league affiliations National League (1876–present) Central Division (1994–present) Current uniform Retired Numbers 10, 14, 23, 26, 42 Name Chicago Cubs (1902–present) Chicago Orphans (1898-1901) Chicago Colts (1890-1897) Chicago White Stockings (1870-1871, 1874-1889) (a. ... Bob Nystrom (born October 10, 1952 in Stockholm, Sweden) is a former ice hockey right-winger. ... The New York Islanders are a professional ice hockey team based in Uniondale, a hamlet located on Long Island in Town of Hempstead, Nassau County, New York, United States. ... Manchester City Football Club is an English professional football club based in the city of Manchester. ... Marc-Vivien Foé Marc-Vivien Foé (May 1, 1975 – June 26, 2003) was a Cameroonian midfield football player, born in Nkolo, Centre Province, Cameroon. ... is the 177th day of the year (178th in leap years) in the Gregorian calendar. ... Year 2003 (MMIII) was a common year starting on Wednesday of the Gregorian calendar. ... The FIFA World Cup Trophy, which has been awarded to the world champions since 1974. ... David Beckham David Robert Joseph Beckham OBE (born May 2, 1975) is an English footballer born in Leytonstone, London. ... This article is about the year 7. ... Year Founded 1995 League Major League Soccer Stadium Home Depot Center Coach Steve Sampson, 2004- All-Time Leaders* Games Cobi Jones, 254 Goals Cobi Jones, 62 Assists Cobi Jones, 82 Shutouts Kevin Hartman, 53 First Game Los Angeles Galaxy 2 - 1 MetroStars (Rose Bowl; April 13, 1996) Largest Win Dallas... Shane Keith Warne (born 13 September 1969 in Upper Ferntree Gully, Victoria), is an Australian cricketer and the current captain of Hampshire. ... Andrew Luke McLeod (born August 4, 1976) is an Australian rules football player in the Australian Football League of Aboriginal descent, and is number 23 of the Adelaide Football Club. ... The Adelaide Football Club, nicknamed the Crows, is an Australian rules football club playing in the Australian Football League, based in Adelaide, South Australia. ...

In music

The doorway David Bowie stands in on the Ziggy Stardust album is number 23.

• Several songs and albums use the number 23 as their titles, including Tristan Prettyman's debut album, the eleventh song from Tool's fourth full-length studio album 10,000 Days, "Viginti Tres" (Latin for twenty-three).
• Blonde Redhead have the album '23' and the song with the same name.
• Jimmy Eat World's song "23" appeared on their album Futures. The number also appears in the songs "Christmas Card" and "12.23.95" as well as on some items of clothing produced by the band.
• Four tet and Yellowcard both have songs titled "Twenty-Three".
• The song "Aquarius", by Boards of Canada, runs through a series of random spoken numbers which ends with the number twenty-three.
• On the album Enema of the State the song What's My Age Again by Blink 182. There is a line that goes "nobody likes you when you're 23"
• In the song "Dancing Nancies" Dave Matthews refers to himself as "23 and so tired of life...."

The cover of Prettymans debut album twentythree Tristan Prettyman (born May 23, 1982) is a singer-songwriter and former Roxy model from San Diego, California. ... Tool is an American rock band that was formed in 1990 in Los Angeles, California. ... 10,000 Days is the Grammy Award-winning fourth full-length studio album by Tool. ... Blonde Redhead is an alternative rock or indie rock band. ... 23 is an upcoming album by Blonde Redhead. ... Jimmy Eat World is an American alternative rock band from Mesa, Arizona, formed in 1993. ... Futures is the fifth studio album by alternative rock band Jimmy Eat World. ... Kieran Hebden spins records in the Grog Shop in Cleveland, Ohio Four Tet is the name used by Kieran Hebden for his electronic music-oriented solo efforts to differentiate from his work with post-rock band Fridge. ... This article is about the band. ... Boards of Canada is a Scottish electronic music duo consisting of brothers Michael Sandison (born 10 June 1969) and Marcus Eoin Sandison (born 21 September 1970). ... Singles from Enema of the State Released: November 9, 1999 Released: January 18, 2000 Released: August 29, 2000 Enema of the State, Blink-182s third, and most successful, studio album, was released June 1, 1999, on MCA Records and features the hits Whats My Age Again?, Adams... Whats My Age Again is one of blink-182s most famous hits, most notably for its video in which the band runs naked through California. ... Blink-182 was an American trio that played pop punk[1][2][3] and punk rock[4][5] music. ... For other persons named David Matthews, see David Matthews (disambiguation). ...

In film and television

• 23 is a German film about Karl Koch
• The Number 23 is a 2007 film starring Jim Carrey.
• 23 is one of The Numbers - 4, 8, 15, 16, 23, and 42 - featured in Lost.
• On the show One Tree Hill, 23 is depicted in many ways throughout the series.
• In the movie Final Destination 2 the initial disaster that sets the events going happens on 'route 23'. also Kimberly, the protoganist of the movie, looks on the sign to see how far the next garage to repair her SUV. the closest garage is 23km away.
• Mr. Hong-Tow a Japanese physiologist would often paint the number 23 on his body
• In The Matrix Reloaded, the Architect tells Neo it is of utmost importantance to choose 23 people to repopulate Zion.

23 is a 1998 German movie about a young hacker Karl Koch, who supposedly committed suicide on May 23, 1989. ... Karl Koch (born July 22, 1965 in Hanover, died - probably - May 23, 1989) was a German hacker in the 1980s, who called himself hagbard, after Hagbard Celine. ... For the actual number, see 23 (number). ... James Eugene Carrey (born January 17, 1962) is a two-time Golden Globe Award-winning Canadian-American A-list film actor and comedian. ... The television show Lost includes a number of mysterious elements that have been ascribed to science fiction or supernatural phenomena, usually concerning coincidences, synchronicity, temporal and spatial anomalies, paradoxes and other puzzling phenomena. ... LOST redirects here. ... Final Destination 2 is a 2003 supernatural thriller, and sequel to the 2000 hit Final Destination. ... The Matrix Reloaded is the second installment in The Matrix trilogy, written and directed by the Wachowski Brothers. ... Thomas A. Anderson (alias Neo) is a fictional character in the Matrix trilogy: The Matrix, The Matrix Reloaded, and The Matrix Revolutions. ...

In other fields

• The 23 Enigma plays a prominent role in the plot of the Illuminatus! Trilogy by Robert Shea and Robert Anton Wilson.
• 23 skidoo was a 20th Century American slang phrase.
• Dr Pepper is advertised as having 23 flavors.
• Titanic Sunk on April 15, 1912 (1 + 5 + 0 + 4 + 1 + 9 + 1 + 2 = 23)
• Julius Caesar was stabbed 23 times when he was assassinated.
• 911 bombed on 11 september 2001, (11+9+2+0+0+1 = 23)

This article or section does not cite its references or sources. ... “Illuminatus” redirects here. ... Robert Joseph Shea (1933 - March 10, 1994) was the co-author (with Robert Anton Wilson) of The Illuminatus! Trilogy. ... Robert Anton Wilson Robert Anton Wilson or RAW (January 18, 1932 – January 11, 2007) was a prolific American novelist, essayist, philosopher, psychologist, futurologist, anarchist, and conspiracy theory researcher. ... For other uses, see Dr Pepper (disambiguation). ... Look up titanic, Titanic in Wiktionary, the free dictionary. ... For other uses, see Julius Caesar (disambiguation). ... This article is about the year 911 A.D.. For the emergency telephone number, see 9-1-1. ...

References

The On-Line Encyclopedia of Integer Sequences (OEIS) is an extensive searchable database of integer sequences, freely available on the Web. ...

External links

• Article in the British newspaper The Mirror regarding the power of the number 23
• A Portal for 23 Knowledge and Culture