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(2^684127-1)/23765203727 is the largest known probable prime Mersenne cofactor (as of 2009). It has 40 times as many digits as the proven record at the time (205933 versus 5118 digits). [Andersen]


  Submitted: 2009-09-06 03:28:28;   Last Modified: 2014-08-30 10:16:45.

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