5

This number is a prime.

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For a given prime p, at most 5 squares are short of a power of 2 by p. (The maximal case, in particular, corresponds to the Ramanujan-Nagell equation x2 = 2n - 7). [Beedassy]

Submitted: 2015-01-15 08:29:48;   Last Modified: 2020-07-26 13:27:11.
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