259

This number is a composite.

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The product of first 259 even numbers plus 1, i.e., 2^259*259!+1 is the only non-titanic prime of form 2^n*n!+1 where n is an integer. [Loungrides]

Submitted: 2016-06-15 16:07:41; Last Modified: 2016-06-16 12:55:23.