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
4975837Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
835940617929.6old
2108814156256791547.62014-03-07 11:48:52
ECM
DigitsB1Curves
25500003 / 280
Estimated T-Level: 20.1
TF below 2^62 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-20kkmrkkblmbrbkC1B2BA664876E13B2013
Verified2018-04-21arnaudC1B2BA664876E13B2192395813
History
DateUserTypeResult
2023-12-07USAFSSNF-PM1
B1=256000, B2=105522060
2018-04-21arnaudC-PRP
M4975837/835940617/210881415625679 : C1B2BA664876E13B
PRP: Verified
PRP without proof (not generated)
2017-09-20kkmrkkblmbrbkC-PRP
M4975837/210881415625679/835940617 : C1B2BA664876E13B
PRP: Verified
PRP without proof (not generated)
2014-03-07TJAOIF
Factor: 210881415625679