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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]
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