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

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MnStatusDetails
2400883Factored
FactorDigitsBitsDate
4491121682159248635738232478.62020-05-22 01:35:36
ECM
DigitsB1Curves
255000046 / 280
Estimated T-Level: 20.8 ⓘ
TF below 2^64 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)schebiCCF6B62094542F0D0
Verified (Factored)Sturle SundeCCF6B62094542F0D0
Verified (Factored)2015-11-14MadPooCCF6B62094542F0D1448645
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-05-22M MillerDC2F5365FB82591C1182437753
Verified2020-05-23Team_InspectorDC2F5365FB82591C1173851753
History
DateUserTypeResult
2020-05-23Team_InspectorC-PRP
M2400883/449112168215924863573823 : DC2F5365FB82591C
PRP: Verified
PRP without proof (not generated)
2020-05-22M MillerC-PRP
M2400883/449112168215924863573823 : DC2F5365FB82591C
PRP: Verified
PRP without proof (not generated)
2020-05-22Chang Chia-TcheF-ECM
Factor: 449112168215924863573823 / (ECM curve 1, B1=50000, B2=5000000, Sigma=6791261605810345)
2019-01-30YxinityNF
no factor from 2^69 to 2^70
2019-01-15Anton RepkoNF
no factor from 2^67 to 2^69
2017-06-29Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^59 to 2^60
2015-11-14MadPooC-LL
CCF6B62094542F0D
2015-10-21ramgeisNF
no factor from 2^65 to 2^66
2015-02-23VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-23VictordeHollanderNF
no factor from 2^63 to 2^64
2014-02-13mikrNF-PM1
B1=3102822, B2=43439508, E=12
2013-12-04Jerry HallettNF
no factor from 2^62 to 2^63
2012-06-02Sebastian HornbostelNF
no factor from 2^61 to 2^62
2010-12-23markrNF-PM1
B1=90000, B2=1845000, E=6
2010-11-16JossNF-PM1
B1=20000
2010-11-08JossNF-PM1
B1=15000
2009-01-16Sturle SundeNF
no factor from 2^60 to 2^61