21000000000000000000001

This number is a prime.

210 0000000000 0000000001

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The largest non-titanic generalized Cullen prime of the form p=n*10^n+1, (case n=21). [Loungrides]

Submitted: 2010-08-30 14:15:35; Last Modified: 2019-01-03 14:55:15.