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

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Exponent Range:










MnStatusDetails
326701Factored
FactorDigitsBitsDate
207676725964677443250735287272994.12019-03-18 11:11:45
ECM
DigitsB1Curves
2550000280 / 280
30250000267 / 640
Estimated T-Level: 27.1 ⓘ
TF below 2^85 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Slowinski764E0
Verified (Factored)Unknown764E0
Verified (Factored)Guillermo Ballester Valor48775A2DBE1D764E0
Verified (Factored)Eivind Triel48775A2DBE1D764E314958
Verified (Factored)2002-01-22Dennis Pope48775A2DBE1D764E50924
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2019-03-19alex67FDB0E2551FAC1314660653
Verified2019-03-24Brett Walker67FDB0E2551FAC1318389453
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2019-03-24Brett WalkerC-PRP
M326701/20767672596467744325073528727 : 67FDB0E2551FAC13
PRP: Verified
PRP without proof (small exponent)
2019-03-19alexC-PRP
M326701/20767672596467744325073528727 : 67FDB0E2551FAC13
PRP: Verified
PRP without proof (small exponent)
2019-03-18alexF-ECM
Factor: 20767672596467744325073528727 / (ECM curve 23, B1=250000, B2=25000000, Sigma=792855778778959)
2018-01-28BloodERazorNF
no factor from 2^64 to 2^65
2016-07-11mikrNF-PM1
B1=60000000, B2=3000000000, E=12
2015-12-13Gordon SpenceNF
no factor from 2^63 to 2^64
2015-12-13Gordon SpenceNF
no factor from 2^62 to 2^63
2015-07-22NRNF
no factor from 2^61 to 2^62
2012-01-13alpertronNF-PM1
B1=10000000, B2=200000000, E=12
2011-08-06JossNF-PM1
B1=1417041
2010-06-06Architects CubedNF
no factor from 2^60 to 2^61
2009-02-06Sturle SundeNF
no factor from 2^59 to 2^60
2008-12-31Sturle SundeNF
no factor from 2^58 to 2^59