# 15555...55551 (33-digits)

This number is a prime.

155 5555555555 5555555555 5555555551

The digital sum of this prime is 157, another prime (whose digit sum in turn is yet another prime: 13). [Trotter]

(There is one curio for this number that has not yet been approved by an editor.)

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell