180181
This number is a prime.
The smallest invertible emirp formed from the concatenation of two successive numbers, i.e., 180 and 181. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
This number is a prime.
The smallest invertible emirp formed from the concatenation of two successive numbers, i.e., 180 and 181. [Loungrides]