23 (number)
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| 23 | 20 | 3 |
|---|
23 (twenty-three) is the natural number following 22 and preceding 24.
| Cardinal | 23 twenty-three |
| Ordinal | 23rd twenty-third |
| Factorization | prime |
| Divisors | 1, 23 |
| Roman numeral | XXIII |
| Binary | 10111 |
| Octal | 27 |
| Hexadecimal | 17 |
Contents |
[edit] 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, and the second Smarandache-Wellin prime. It is an Eisenstein prime with no imaginary part and real part of the form 3n − 1.
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.
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.
23 is a Wedderburn-Etherington number and the sixth happy number. The codewords in the perfect (non-extended) binary Golay code are of size 23.
[edit] In science
- The atomic number of vanadium and the approximate atomic mass (in u) of sodium.
- The number of chromosomes in a human germline cell
- Human sex cells have 23 chromosomes. Other human cells have 2 sets of 23 chromosomes (23 from mother, 23 from father).
- Avogadro's number used in chemistry is 6.0221367×1023.
[edit] Astronomy
- Messier object M23 is a magnitude 6.0 open cluster in the constellation Sagittarius
- The New General Catalogue object NGC 23 is a magnitude 12.0 barred spiral galaxy in the constellation Pegasus
- The planet Neptune was discovered on September 23, 1846.
[edit] In religion
- Psalm 23, also known as the Shepherd Psalm, is possibly the most quoted and best known psalm.
- In the religion of Discordianism, 23 is considered a holy number.
- In Islam, the Quran was revealed in a total of 23 years to Muhammad.[citation needed]
- France has twenty-three archbishops; the current Archbishop of Paris is André Vingt-Trois
[edit] In numerology
- The sacred number (along with 5) of Eris, goddess of discord, according to the Principia Discordia; it is the number of the Illuminati.
- Like 13, sometimes considered unlucky or otherwise significant (as in the occult writings of Aleister Crowley and William S. Burroughs); see the 23 enigma.
- Robert Anton Wilson's trilogy, The Illuminatus! Trilogy, list 23 as a cosmic number with strong connections to arcane magic and synchronicity.
[edit] In sports
- The squad number (or jersey number) of various athletes:
- Michael Jordan's jersey number, with the exception of a short period of time, when he played for the Chicago Bulls basketball team. The number now has special significance throughout sports, especially in basketball. Many athletes wear the number 23 either as a tribute to Jordan or because they would like to "be like Mike." Two examples of this in football (soccer) are David Beckham at LA Galaxy and the ex-Arsenal player Sol Campbell.
- Don Mattingly's number when he played for the New York Yankees baseball team. It was retired on August 31, 1997.
- Manchester City F.C. have not assigned the squad number 23 to any player since 2003. This is due to the fact that 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.
- Michael Clarke's number in One-Day International cricket, passed on from Shane Warne in 2004 after Warne's retirement.
- Devin Hester's number for the Chicago Bears.
- Scott Gomez's jersey number that he wears for the NHL's New Jersey Devils.
- David Beckham's shirt number in Real Madrid,when he played at this club(2003-2007).
[edit] In music
23 is composer Alban Berg's self-professed 'number of fate': for example, his 'Lyric Suite' for String Quartet includes a variety of references to 23, including nonstandard metronome markings that are all multiples of 23. Each movement is some multiple of 23 measures long, and there are significant structural elements at measures numbered in multiples of 23.
[edit] Song titles
Several songs use "twenty three" as their titles, including:
- Tristan Prettyman's debut album.
- The eleventh song off of Tool (band)'s fourth full-length studio album "10,000 Days". The song's title is actually "Viginti Tres", which is Latin for twenty three.
- The seventh album by Blonde Redhead, released in the United States by 4AD Records on April 10, 2007. Also the first song and single off the album.
- The fourth song off of Shpongle's second album, "Tales of the Inexpressible" is often called "Room 23," but the character following the two is actually Om, the sacred Hindu sylable.
- The eleventh song off of Jimmy Eat World's fifth album, "Futures."
[edit] In visual media
- 23 is a German movie about Karl Koch
- The Number 23 is a 2007 film starring Jim Carrey.
- 23 is the number of people (16 females, 7 males) that Neo would have had to select in order to re-found Zion in The Matrix Trilogy. [1]
- 23 is often used in artist Jamie Hewlett's work.
- 23 is the fifth of the mystical numbers--4, 8, 15, 16, 23, and 42--in Lost (TV series)
gayness
[edit] Historical years
[edit] References
- ^ http://www.internationalhero.co.uk/n/neo.htm, accessed 31st March 2007
