47

This number is a prime.

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

Submitted: 1999-09-02 23:40:00; Last Modified: 2011-08-01 17:35:01.