161111111111111111

This number is a prime.

16111111 1111111111

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The only non-titanic near-repunit prime (emirp) that is composed of a square number n followed by n 1's, (n=16). [Loungrides]

Submitted: 2010-02-12 05:11:19; Last Modified: 2018-04-26 11:01:03.