317

This number is a prime.

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

Richard McIntosh notes that the largest prime of the form (2^4p + 1)/17 has p = 317, but that (2^4p + 1)/17 is composite for all prime p with 317 < p < 10000. Nobody knows if there are any more such primes. [Post]

Submitted: 2005-02-20 22:16:13; Last Modified: 2008-01-30 17:28:00.