# 23

This number is a prime.

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Kristen Eller ©2002 |

23 is the smallest and only prime of the form 2x^2 - y^2 and 3x^2 - y^2, where x and y are two consecutive numbers. [Teofilatto]

23 is the smallest prime equal to the sum of three distinct primes in two ways: 5+7+11 = 3+7+13 = 23. [Teofilatto]

23 = (2^2 + 3^3) - (2! + 3!). [Teofilatto]

(There is one curio for this number that has not yet been approved by an editor.)

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