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

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MnStatusDetails
2020661Factored
FactorDigitsBitsDate
11323389498338076933972595032889.92020-02-29 19:02:54
ECM
DigitsB1Curves
2550000280 / 280
30250000162 / 640
Estimated T-Level: 26.3
TF below 2^82 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Ulrich Kuckert977603765C5A01F60
Verified (Factored)1999-04-13Stefan Wenzel977603765C5A01F61303925
Verified (Factored)2016-07-15Mark Rose977603765C5A01F61340876
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-03-01Christoph Zenger2CB145E40B6A85061192511853
Verified2020-03-03Bommer2CB145E40B6A85061176613153
History
DateUserTypeResult
2020-03-03BommerC-PRP
M2020661/1132338949833807693397259503 : 2CB145E40B6A8506
PRP: Verified
PRP without proof (not generated)
2020-03-01Christoph ZengerC-PRP
M2020661/1132338949833807693397259503 : 2CB145E40B6A8506
PRP: Verified
PRP without proof (not generated)
2020-02-29KeysarecoolF-ECM
Factor: 1132338949833807693397259503 / (ECM curve 2, B1=50000, B2=5000000, Sigma=5451787440860108)
2019-03-18chuenkitNF
no factor from 2^67 to 2^68
2019-02-25mikrNF-PM1
B1=4000000, B2=200000000, E=12
2016-07-15Mark RoseC-LL
977603765C5A01F6
2016-07-02Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-10-28ramgeisNF
no factor from 2^65 to 2^66
2015-04-10VictordeHollanderNF
no factor from 2^64 to 2^65
2015-04-10VictordeHollanderNF
no factor from 2^63 to 2^64
2013-10-18David CampeauNF-PM1
B1=580000, B2=15080000, E=12
2013-02-11dbaughNF
no factor from 2^62 to 2^63
2012-02-04Sebastian HornbostelNF
no factor from 2^61 to 2^62
2010-12-08JossNF-PM1
B1=202066
2009-01-02Sturle SundeNF
no factor from 2^60 to 2^61