641491

This number is a prime.

+ The prime p = 641491 is the smallest known counterexample to Masley's suggestion of how one might prove Vandiver's conjecture, i.e., show that the class number h(Q(ζp + ζp-1)) is smaller than p. [Poo Sung]

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell