This number is a prime.
A prime that equals the number of integers between two Mersenne primes. For example, there are 131063 integers between 2^3-1 and 2^17-1. The sequence begins 3, 23, 131063, 2305843009213562879, etc. [Honaker]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell