The book is now available! 23765203727
(another Prime Pages' Curiosity)
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                                                                2 3765203727
+ (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]

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