19

This number is a prime.

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For k = 1, 2, 3, ... 19 at least one of the integers of the form 6k + 1 or 6k - 1 is prime. [Crespi de Valldaura]

Submitted: 1999-09-02 23:40:00; Last Modified: 2008-01-30 17:28:00.