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
2528831Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
599080063911135.8old
1282875966311236.92008-07-14 20:24:43
ECM
DigitsB1Curves
2550000133 / 280
Estimated T-Level: 22.4
TF below 2^69 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-15kkmrkkblmbrbk6F78C92B243F07082105145853
Verified2017-11-09Oliver Kruse6F78C92B243F07082147256753
History
DateUserTypeResult
2022-08-23USAFSSNF-PM1
B1=300000, B2=259451010
2017-11-09Oliver KruseC-PRP
M2528831/59908006391/128287596631 : 6F78C92B243F0708
PRP: Verified
PRP without proof (not generated)
2017-10-15kkmrkkblmbrbkC-PRP
M2528831/59908006391/128287596631 : 6F78C92B243F0708
PRP: Verified
PRP without proof (not generated)
2008-07-14George WoltmanF-ECM
Factor: 128287596631