70000...00007 (25-digits)

This number is a prime.

                                                 70000 0000000500 0000000007

+ The only square-congruent prime p of order 5 of the form p = a000...0b0...000a. [Loungrides]

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