41111...11111 (73-digits)

This number is a prime.

                                                                         411
1111111111 1111111111 1111111111 1111111111 1111111111 1111111111 1111111111

+ The largest prime less than a googol in the sequence 4, 41, 411, 4111, 41111, etc. [Jha]

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