Prime Curios!: 61

61
(another Prime Pages' Curiosity)

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It is not known whether the double-Mersenne number MM(61) is prime or composite. It contains 694,127,911,065,419,642 digits and is currently far too large for the usual Lucas-Lehmer test.

Submitted: 2006-08-26 21:12:11; Last Modified: 2009-02-07 19:12:32.