73

This number is a prime.

Single Curio View: (Seek other curios for this number)

The largest known prime p such that p - 2^k, with p > 2^k, is prime or semiprime for all k > 0. [Capelle]

Submitted: 2009-07-29 20:14:58; Last Modified: 2009-07-29 20:27:09.