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

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MnStatusDetails
2311583Factored
FactorDigitsBitsDate
3474002251047638083432168.22020-12-14 17:53:32
ECM
DigitsB1Curves
2550000114 / 280
Estimated T-Level: 22.0 ⓘ
TF below 2^68 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Hamer212B70675799D2A90
Verified (Factored)1999-03-01Steve Gelatko212B70675799D2A986081
Verified (Factored)2018-05-03kkmrkkblmbrbk212B70675799D2A91814512
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-12-15Maciej Kmieciak09B85573FAD67490149728353
History
DateUserTypeResult
2020-12-15curtiscCERT
PRP Certification
Proof certified good
2020-12-15Maciej KmieciakC-PRP
M2311583/347400225104763808343 : 09B85573FAD67490
PRP proof power = 7
PRP: Verified
Proof certified good
2020-12-14daveward2005F-ECM
Factor: 347400225104763808343 / (ECM curve 3, B1=50000, B2=5000000, Sigma=7970584366063861)
2019-04-22TJAOINF
no factor from 2^67 to 2^68
2018-05-03kkmrkkblmbrbkC-LL
212B70675799D2A9
2018-01-06Sid & AndyNF-PM1
B1=6000000, B2=180000000, E=12
2017-05-30Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^1 to 2^60
2015-10-22ramgeisNF
no factor from 2^65 to 2^66
2015-03-03VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-03VictordeHollanderNF
no factor from 2^63 to 2^64
2013-12-06Jerry HallettNF
no factor from 2^62 to 2^63
2012-05-23Sebastian HornbostelNF
no factor from 2^61 to 2^62
2010-02-15BudNF-PM1
B1=500000, B2=10000000, E=12
2009-01-14Sturle SundeNF
no factor from 2^60 to 2^61