47

This number is a prime.

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© 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]