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Old 2019-12-08, 03:41   #500
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Sep 2003

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The 340th fully-factored or probably-fully-factored Mersenne number with prime exponent (not including the Mersenne primes themselves) is M3733.

The most recent factor (53 digits) was found by Ryan Propper and the PRP test was done by Yuji Hasegawa. It was the seventh factor for this exponent.

The cofactor has already been certified prime by Primo.

FactorDB link

George let me know about it, since PrimeNet once again did not send the usual notification.
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