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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Exponent Range:










MnStatusDetails
321329Factored
FactorDigitsBitsDate
2729192255662698993428941372787.82019-03-14 10:25:12
ECM
DigitsB1Curves
2550000280 / 280
30250000383 / 640
Estimated T-Level: 28.0 ⓘ
TF below 2^88 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Slowinski6FDE0
Verified (Factored)Unknown6FDE0
Verified (Factored)Guillermo Ballester ValorCA414D549179EFDE0
Verified (Factored)Eivind TrielCA414D549179EFDE113302
Verified (Factored)2002-01-15Dennis PopeCA414D549179EFDE277180
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2019-03-15Chang Chia-Tche74C9246885C27D2814136753
Verified2019-03-16kkmrkkblmbrbk74C9246885C27D28121533753
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2019-03-16kkmrkkblmbrbkC-PRP
M321329/272919225566269899342894137 : 74C9246885C27D28
PRP: Verified
PRP without proof (small exponent)
2019-03-15Chang Chia-TcheC-PRP
M321329/272919225566269899342894137 : 74C9246885C27D28
PRP: Verified
PRP without proof (small exponent)
2019-03-14alexF-ECM
Factor: 272919225566269899342894137 / (ECM curve 194, B1=250000, B2=25000000, Sigma=7589020075654967)
2018-01-22Gordon SpenceNF
no factor from 2^64 to 2^65
2016-06-21mikrNF-PM1
B1=60000000, B2=3000000000, E=12
2015-12-08Gordon SpenceNF
no factor from 2^63 to 2^64
2015-12-08Gordon SpenceNF
no factor from 2^62 to 2^63
2015-07-22NRNF
no factor from 2^61 to 2^62
2012-04-27David CampeauNF
no factor from 2^60 to 2^61
2012-01-19alpertronNF-PM1
B1=10000000, B2=200000000, E=12
2011-08-06JossNF-PM1
B1=1447833
2009-01-24Sturle SundeNF
no factor from 2^59 to 2^60
2008-12-30Sturle SundeNF
no factor from 2^58 to 2^59