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

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MnStatusDetails
2444473Factored
FactorDigitsBitsDate
208181875713424932109692374.12020-07-14 15:34:38
ECM
DigitsB1Curves
255000060 / 280
Estimated T-Level: 21.1
TF below 2^65 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Marc HoneyEB456C23C0F1BB130
Verified (Factored)1999-05-23W. IzattEB456C23C0F1BB13619121
Verified (Factored)2018-05-24kkmrkkblmbrbkEB456C23C0F1BB131594217
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-07-14MarkSF209A77EDD9F0939167328653
Verified2020-07-15marssystemsF209A77EDD9F09391150691753
History
DateUserTypeResult
2020-07-15marssystemsC-PRP
M2444473/20818187571342493210969 : F209A77EDD9F0939
PRP: Verified
PRP without proof (not generated)
2020-07-14MarkSC-PRP
M2444473/20818187571342493210969 : F209A77EDD9F0939
PRP: Verified
PRP without proof (not generated)
2020-07-14GANF-ECM
Factor: 20818187571342493210969 / (ECM curve 3, B1=50000, B2=5000000, Sigma=2566588869591489)
2019-04-08TJAOINF
no factor from 2^67 to 2^68
2019-03-23Sid & AndyNF-PM1
B1=6000000, B2=180000000, E=12
2018-05-24kkmrkkblmbrbkC-LL
EB456C23C0F1BB13
2017-07-12Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^59 to 2^60
2015-10-25ramgeisNF
no factor from 2^65 to 2^66
2015-02-27VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-27VictordeHollanderNF
no factor from 2^63 to 2^64
2014-01-22mikrNF-PM1
B1=1172000, B2=48000000, E=12
2013-12-04Jerry HallettNF
no factor from 2^62 to 2^63
2011-10-03Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-01-18Oscar ÖstlinNF-PM1
B1=95000, B2=1947500, E=6
2010-11-17JossNF-PM1
B1=20000
2009-01-15Sturle SundeNF
no factor from 2^60 to 2^61