23

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23 is number one and 11. Its full reduction is 5, although everyone knows this, so it's kind of trivial.

Humans have 23 chromosomes.

Interesting mathematical properties of 23 that I stole from Wikipedia[edit | edit source]

  • Being the ninth prime, the smallest odd prime that is not a twin prime, the fifth factorial prime, the second Woodall prime, an Eisenstein prime with no imaginary part and real part of the form 3n-1, the third base-10 repunit prime exponent, the fifth Sophie Germain prime, the fourth safe prime, the next to last member of the first Cunningham chain of the first kind to have five terms, a Pillai prime, and the first prime p for which unique factorization of cyclotomic integers based on the p the root of unity breaks down
  • Being the smallest odd prime to be a highly cototient number
  • Being one of the few numbers p where the sum of the first p primes is divisble by p
  • Being listed twice in the list of fortunate numbers
  • Being one of two integers that cannot be expressed as the sum of fewer than 9 cubes of positive integers
  • Being a Wedderburn-Etherington number
  • Being the number of a group of people that is needed for the probability of some pair of them to have the same birthday to be more than 50%
  • Being the second Smarandache-Wellin prime in base 10, a happy number in base ten, and one of three numbers p whose factorial is p digits long
  • The natural logarithms of all positive integers lower than 23 are known to have binary BBP-type formulae.
  • Being the smallest prime number p such that the largest consecutive pair of p-smooth numbers is the same as the largest consecutive pair of (p − 1)-smooth numbers, as given in the On-Line Encyclopedia of Integer Sequences sequence A228611
  • Being the smallest positive solution to Sunzi's original formulation of the Chinese remainder theorem.

Other uses[edit | edit source]