Number 23

A page of the Numeropedia - the Special Encyclopedia of Numbers

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[Biology]  The number of pairs of chromosomes in each human cell. The male set differs from the female set only in the 23rd pair, the sex pair: male set has an X and Y instead of two Xs in a female set.

[Calendar]  September 22 or 23 is the Autumn Equinox day: Fall begins; day and night are equal lengths.

[Chemistry]  The atomic number of Vanadium (V).

[Geology]  The Tropic of Cancer is at the North 23o 27’ latitude line; or the latitude of the Summer Solstice. The Tropic of Capricorn is at the South 23o 27’ latitude line; the latitude of the Winter Solstice.

[Gov.]  The only FBI position having an age restriction is the Special Agent position. The minimum age is 23 and the maximum age is 37.

[History]  Maine became the 23rd state of the U.S. on 15 March 1820.

[History]   The 23rd U.S. President: Benjamin Harrison (Republican, Ohio, 1889-1893).

[Language]  The 23rd hour usually means the last hour effort/situation. As does the 11th hour.

[Math.]  A bi-truncatable prime number.

[Math.]  23 = 05+14+23+32+41+50.

[Math.]  One of only four 2-digit prime numbers whose digits are consecutive: 23, 43, 67 and 89.

[Math.]  One of two 2-digit prime numbers whose digits are consecutive prime numbers. The other prime number is 53.

[Math.]  The Birthday paradox number. In a group of 23 or more people, there is a probability of greater than 50% that at least 2 of them sharing the same birthday.

[Math.]  The number of major mathematical problems outlined by the mathematician David Hilbert at the International Congress of Mathematicians (Paris, 1900) to be studied in the 20th century.

[Math.]  The 2nd Woodall prime number: 3´23–1 = 23.

The first Woodall prime numbers (of the form n´2n–1) are with n = 2, 3, 6, 30, 75, 81…

[Math.]

23×64 = 1,472 = 32×46

23×96 = 2,208 = 32×69

64×69 = 4,416 = 96×46.

[Math.]  The only known 7 prime numbers consisting of the repeated digits 1 are the numbers of 2, 19, 23, 317, 1031, 49,081 and 86,453 digits 1.

[Math.]  414,347 is a prime number, formed by 3 consecutive prime numbers 41, 43 and 47 and its evenly decomposed sums are also prime numbers: 414+347 = 761, 41+43+47 = 131 and 4+1+4+3+4+7 = 23.

[Math.]  Every integer can be a sum of at most 8 cube numbers, except number 23 and 239, which requires 9 cube numbers.

[Math.]

22333 is divisible by 23: 22333 = 23×971.

44333 is divisible by 43: 44333 = 43×1031.

555533333 is divisible by 53: 555533333 = 53×10481761.

[Math.]  A digit-wraparound prime number 23,456,789 and its “partitions” 23, 4567 and 89 are also all prime numbers.

[Math.]  The largest 23-digit prime number: 1023–23.

[Math.]  The smallest odd prime number which does not have a twin; i.e, both numbers 21 and 25 are composite numbers. (C. Heckman)

[Math.]  A supersingular prime numbers factors of the order of the Monster group M: 246×320×59×76×112×133×17×19×23×29×31×41×47×59×71 =

= 808017424794512875886459904961710757005754368000000000.

[Math.]  The largest 23-digit prime number:

1023–23 = 99,999,999,999,999,999,999,977.

[Movie]  Names of TV shows/series or movies: “23” and “The Number 23”.

[Sport]  The official roster of a professional soccer team has 23 players (11 starting and 12 reserved).

[Trivia]  Dr Pepper’s “Authentic Blend of 23 Flavors”

[Trivia]  Imaginary rhythms have 23-day “physical” cycles, 28-day “emotional” cycles and 33-day “intellectual” cycles. The complete rhythm cycle is 21,252 days (over 58 years).

23.14...

[Math.]  The number ep = 23.14069263… is transcendental by Gelfand-Schneider theorem, while we still do not know if pe = 22.459157… is a rational number or not.

[Math.]  The digits 926 appears 2 places after the digits 3.14 in both numbers ep = 23.14069263 and p = 3.141592653.

23.75

[Sport]  The 3-point line in NBA is 22 feet at the corners, arcing to a maximum 23 feet 9 inches.

22 & 23

[History]  The 23rd U.S. President: Benjamin Harrison (Republican, Ohio, 1889-1893).

His Vice President, Levi Parsons Morton (New York), was the 22nd U.S. Vice President

23 & 24 and 21 & 22

[History]  The 22nd and 24th U.S. President: Stephen Grover Cleveland (Democrat, New Jersey, 1885-1889 and 1893-1897).

His Vice President of the 22nd Presidency, Thomas Andrews Hendricks (Indiana, 1885), was the 21st U.S. Vice President.  There was no Vice President in the period 1885-1889.

His Vice President of the 24th Presidency, Adlai Ewing Stevenson (Illinois, 1893-1897), was the 23rd U.S. Vice President.