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
2970941Factored
FactorDigitsBitsDate
39401354119146491224632271.72020-10-17 20:30:14
ECM
DigitsB1Curves
255000031 / 280
Estimated T-Level: 20.6 ⓘ
TF below 2^63 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Ronald PearlA08567CDBDAD97850
Verified (Factored)1999-12-15Stuart LightA08567CDBDAD97852356537
Verified (Factored)2018-10-17kkmrkkblmbrbkA08567CDBDAD97851817351
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-10-18mrhDFF4F0D61E2FA589170713553
History
DateUserTypeResult
2020-10-18Simon JosefssonCERT
PRP Certification
Proof certified good
2020-10-18mrhC-PRP
M2970941/3940135411914649122463 : DFF4F0D61E2FA589
PRP proof power = 7
PRP: Verified
Proof certified good
2020-10-17daveward2005F-ECM
Factor: 3940135411914649122463 / (ECM curve 6, B1=50000, B2=5000000, Sigma=7151345354884813)
2018-12-25chuenkitNF
no factor from 2^67 to 2^68
2018-10-17kkmrkkblmbrbkC-LL
A08567CDBDAD9785
2017-12-03Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-28ramgeisNF
no factor from 2^65 to 2^66
2015-05-02VictordeHollanderNF-PM1
B1=1000000, B2=20000000, E=12
2015-04-29VictordeHollanderNF
no factor from 2^64 to 2^65
2015-04-29VictordeHollanderNF
no factor from 2^63 to 2^64
2013-01-07dbaughNF
no factor from 2^62 to 2^63
2011-11-28Sebastian HornbostelNF
no factor from 2^61 to 2^62
2010-10-28markrNF-PM1
B1=95000, B2=1995000, E=6
2009-02-14Sturle SundeNF
no factor from 2^60 to 2^61