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

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MnStatusDetails
3261281Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
65961586539992850799372272.52009-05-25 10:44:44
ECM
DigitsB1Curves
25500004 / 280
Estimated T-Level: 20.1 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Thomas HonoldBB92C29818E52AE30
Verified (Factored)Chris SmithBB92C29818E52AE30
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-11-02Oliver Kruse3527AD9147E3947E1296151853
Verified2017-12-13kkmrkkblmbrbk3527AD9147E3947E1301380053
History
DateUserTypeResult
2022-04-06LordJuliusNF
no factor from 2^66 to 2^67
2022-04-06LordJuliusNF
no factor from 2^65 to 2^66
2022-04-06LordJuliusNF
no factor from 2^64 to 2^65
2022-04-06LordJuliusNF
no factor from 2^63 to 2^64
2022-04-06LordJuliusNF
no factor from 2^62 to 2^63
2022-04-06LordJuliusNF
no factor from 2^1 to 2^62
2021-12-22JossNF-PM1
B1=3261281, B2=637437570
2021-12-19JossNF-PM1
B1=3261281, B2=109008900
2021-07-12JossNF
no factor from 2^67 to 2^68
2021-07-12JossNF-PM1
B1=3261281
2021-01-18JossNF-PM1
B1=326128, B2=3261281, E=6
2020-12-25JossNF-PM1
B1=108709
2017-12-13kkmrkkblmbrbkC-PRP
M3261281/6596158653999285079937 : 3527AD9147E3947E
PRP: Verified
PRP without proof (not generated)
2017-11-02Oliver KruseC-PRP
M3261281/6596158653999285079937 : 3527AD9147E3947E
PRP: Verified
PRP without proof (not generated)
2009-05-25StKlF-ECM
Factor: 6596158653999285079937
2009-04-04S485122NF
no factor from 2^60 to 2^61