5555555555555555555519

This number is a prime.

55 5555555555 5555555519

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The smallest prime formed by concatenating (p+1) 5’s followed by a prime p, (case p=19). Note that there is no one prime formed by n 5’s followed by n, where n is any number. [Loungrides]

Submitted: 2018-01-27 18:27:03; Last Modified: 2018-12-24 09:20:31.