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

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MnStatusDetails
3882563Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
674654900927034796739512375.82016-03-31 02:15:38
ECM
DigitsB1Curves
255000012 / 280
Estimated T-Level: 20.2 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)1998-05-16Team love_fest29021AEEDA0B6A850
Verified (Factored)2000-05-31Stuart Light29021AEEDA0B6A852016028
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-20kkmrkkblmbrbk670B0D66C16D6E041013
Verified2017-12-27Oliver Kruse670B0D66C16D6E041246615013
P-1 factors
DateFactorB1B2
2016-03-31674654900927034796739512299960
History
DateUserTypeResult
2022-05-25JossNF-PM1
B1=200000, B2=130364850
2017-12-27Oliver KruseC-PRP
M3882563/67465490092703479673951 : 670B0D66C16D6E04
PRP: Verified
PRP without proof (not generated)
2017-09-20kkmrkkblmbrbkC-PRP
M3882563/67465490092703479673951 : 670B0D66C16D6E04
PRP: Verified
PRP without proof (not generated)
2016-03-31JossF-PM1
Factor: 67465490092703479673951 / (P-1, B1=229996)
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-18ramgeisNF
no factor from 2^65 to 2^66
2015-01-18VictordeHollanderNF
no factor from 2^64 to 2^65
2015-01-18VictordeHollanderNF
no factor from 2^63 to 2^64
2014-10-28JossNF-PM1
B1=86531
2012-02-29GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-10-15Squeeky_SquirrelNF-PM1
B1=70000, B2=1137500, E=6
2011-02-11markrNF
no factor from 2^61 to 2^62
2009-07-30Carsten KossendeyNF-PM1
B1=20000, B2=275000
2009-02-25S485122NF
no factor from 2^60 to 2^61