# 5555555555555555555519

This number is a prime.

55 5555555555 5555555519

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]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell