1999999999999999999979

This number is a prime.

19 9999999999 9999999979

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The only non-titanic prime of form p=2*10^n-n, where n is a composite, (n=21). [Loungrides]

Submitted: 2015-07-19 18:01:34; Last Modified: 2018-12-16 13:42:17.