15831...57701 (474-digits)

This number is a prime.

+ A prime formed from summing n concatenated n times up to 158. I.e., 1 + 22 + 333 + ... + 158158158...158 (158 concatenated 158 times) is prime. [Earls]

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