68956417

This number is a prime.

+ The larger known prime of the form P(m^2 + 1) = n^2 + 1 for m = 2015 and n = 8304. There are two smaller known and no others up to n = 2000000. See Puzzle 505. [Rivera]

(There is one curio for this number that has not yet been approved by an editor.)

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