241

This number is a prime.

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241 = (22^2-2)/2. Can you find the next prime of form (t^2-2)/2, where t is a repdigit of form 2*(10^n-1)/9? [Honaker]

Submitted: 2018-04-04 21:36:49; Last Modified: 2018-04-05 04:00:06.