This number is a prime.

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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]

Submitted: 2005-02-03 16:09:39;   Last Modified: 2008-08-01 01:40:15.
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