117643
This number is a prime.
The smallest emirp p of form 7^n-n, (case n=6), i.e.,
7^6-6=117643. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a prime.
The smallest emirp p of form 7^n-n, (case n=6), i.e.,
7^6-6=117643. [Loungrides]