47

This number is a prime.

Just showing those entries submitted by 'Keller': (Click here to show all)

© Disney/Pixar
+ 47 * 2583 + 1, 47 * 21483 + 1 and 47 * 26115 + 1 are the only known primes of the form 47 * 2n + 1. [Ballinger and Keller]

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