11777
This number is a prime.
An emirp since its reversal 77711 is also prime. Note that their blended format 1177711 is a palindromic prime. [De Geest]
The smallest emirp p such that p + 2 and p + 6 are emirps. [Firoozbakht]
The smallest emirp formed by inserting a semiprime between its prime factors. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell