This number is a composite.
Single Curio View: (Seek other curios for this number)Mersenne wrongly thought 2^257-1 is prime. In fact, 52 is the smallest base b for which (b^257-1)/b-1 is actually prime.
Submitted: 2003-12-01 19:29:00; Last Modified: 2008-01-30 11:28:00.
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