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
6983231Factored
FactorDigitsBitsDate
64127148351612739519033551612892.42021-11-29 01:10:53
ECM
DigitsB1Curves
25500006 / 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)1999-08-31EDNY52242E75C7DEABC01492171
Verified (Factored)2002-08-24M. D. S.52242E75C7DEABC02280953
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2021-12-05LaurV25E92E49D796A21B1673708853
P-1 factors
DateFactorB1B2
2021-11-2964127148351612739519033551614000000110000000
History
DateUserTypeResult
2021-12-05Ben DeloCERT
PRP Certification
Proof certified good
2021-12-05LaurVC-PRP
M6983231/6412714835161273951903355161 : 25E92E49D796A21B
PRP proof power = 8
PRP: Verified
Proof certified good
2021-11-29Seth_TrF-PM1
Factor: 6412714835161273951903355161 / (P-1, B1=4000000, B2=110000000, E=12)
2021-09-19Jon PaceNF
no factor from 2^71 to 2^72
2021-09-15SRBaseNF
no factor from 2^70 to 2^71
2021-08-11takahashiNF
no factor from 2^69 to 2^70
2020-04-10TJAOINF
no factor from 2^68 to 2^69
2020-01-31takahashiNF-PM1
B1=600000, B2=12000000, E=12
2018-02-26-Anonymous-NF
no factor from 2^67 to 2^68
2016-04-26Gordon SpenceNF
no factor from 2^66 to 2^67
2015-07-03VictordeHollanderNF
no factor from 2^65 to 2^66
2014-02-14lycornNF
no factor from 2^64 to 2^65
2014-02-09NesowaNF
no factor from 2^63 to 2^64
2011-12-11James HeinrichNF-PM1
B1=135000, B2=2835000, E=6