# 641491

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(ζ

_{p}+ ζ

_{p}

^{-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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