77777...73553 (100-digits)

This number is a prime.

                                            7777777777 7777777777 7777777777
7777777777 7777777777 7777777777 7777777777 7777777777 7777777777 7777573553

+ The largest prime less than a googol and consisting only of prime digits. [Gupta]

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