Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
1816777Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
54503311825.7old
21365297531031.02008-07-15 07:46:58
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 640
Estimated T-Level: 25.8
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-03Oliver KruseFCB98A362C1DBF0C2013
Verified2017-11-11kkmrkkblmbrbkFCB98A362C1DBF0C2118173113
History
DateUserTypeResult
2017-11-11kkmrkkblmbrbkC-PRP
M1816777/54503311/2136529753 : FCB98A362C1DBF0C
PRP: Verified
PRP without proof (not generated)
2017-10-03Oliver KruseC-PRP
M1816777/54503311/2136529753 : FCB98A362C1DBF0C
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-07-15J FeitsmaF
Factor: 2136529753