Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

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MnStatusDetails
3211451Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
6422903722.6old
160572551927.32008-09-07 19:44:52
ECM
DigitsB1Curves
255000048 / 280
Estimated T-Level: 20.9
TF below 2^64 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-11-01Oliver Kruse3F08AB0AB6213627261764453
Verified2017-12-13kkmrkkblmbrbk3F08AB0AB62136272142145253
History
DateUserTypeResult
2022-09-11JossNF-PM1
B1=1000000, B2=241175550
2022-03-11JossNF-PM1
B1=1000000, B2=134343300
2021-04-07JossNF
no factor from 2^67 to 2^68
2020-12-25JossNF-PM1
B1=321145, B2=3211451, E=6
2017-12-13kkmrkkblmbrbkC-PRP
M3211451/6422903/160572551 : 3F08AB0AB6213627
PRP: Verified
PRP without proof (not generated)
2017-11-01Oliver KruseC-PRP
M3211451/6422903/160572551 : 3F08AB0AB6213627
PRP: Verified
PRP without proof (not generated)
2008-09-07Will EdgingtonF
Factor: 160572551