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Old 2003-12-04, 02:02   #1
optim
 
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Nov 2003
European Union

23·13 Posts
Default probability of finding a Mersenne prime

The Status command of the Prime95 client outputs: "The chance that the exponent you are testing will yield a Mersenne prime is about 1 in 278494".

How is this probability (1 in 278494) calculated?
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