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

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MnStatusDetails
2042281Factored
FactorDigitsBitsDate
21655883059459255226297692580.82024-02-19 12:51:43
11372419577048762892857397582493199.82019-07-06 19:31:33
ECM
DigitsB1Curves
2550000280 / 280
30250000129 / 640
Estimated T-Level: 26.0
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Jean PennéFAE8631526479BA70
Verified (Factored)1999-01-10Kai-ming PoonFAE8631526479BA71893713
Verified (Factored)2016-07-15Mark RoseFAE8631526479BA7528154
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2019-07-07Niels_Mache_NextcloudAF9201D6F9F367F71112239953
Verified (Factored)2019-07-08kkmrkkblmbrbkAF9201D6F9F367F7187130553
Verified2024-02-19Naegi MakotoAF9201D6F9F367F7267612753
P-1 factors
DateFactorB1B2
2019-07-0611372419577048762892857397582494000000200000000
History
DateUserTypeResult
2024-02-19WeakForceBosonCERT
PRP Certification
Proof certified good
2024-02-19Naegi MakotoC-PRP
M2042281/2165588305945925522629769/1137241957704876289285739758249 : AF9201D6F9F367F7
PRP proof power = 7
PRP: Verified
Proof certified good
2024-02-19TJAOIF-ECM
Factor: 2165588305945925522629769 / (ECM curve 13, B1=250000, B2=40000000, Sigma=7416950214809986)
2019-07-08kkmrkkblmbrbkC-PRP
M2042281/1137241957704876289285739758249 : AF9201D6F9F367F7
PRP: Verified (Factored)
PRP without proof (not generated)
2019-07-07Niels_Mache_NextcloudC-PRP
M2042281/1137241957704876289285739758249 : AF9201D6F9F367F7
PRP: Verified (Factored)
PRP without proof (not generated)
2019-07-06mikrF-PM1
Factor: 1137241957704876289285739758249 / (P-1, B1=4000000, B2=200000000, E=12)
2019-06-29BigBrotherNF-PM1
B1=1000000, B2=20000000, E=12
2019-03-22chuenkitNF
no factor from 2^67 to 2^68
2016-08-04Gordon SpenceNF
no factor from 2^66 to 2^67
2016-07-15Mark RoseC-LL
FAE8631526479BA7
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-11-01ramgeisNF
no factor from 2^65 to 2^66
2015-10-06Bruno VictalNF-PM1
B1=500000, B2=15000000, E=12
2015-04-13VictordeHollanderNF
no factor from 2^64 to 2^65
2015-04-13VictordeHollanderNF
no factor from 2^63 to 2^64
2014-10-19JossNF-PM1
B1=166428
2013-08-30ramgeisNF
no factor from 2^62 to 2^63
2012-02-27Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-01-31markrNF-PM1
B1=135000, B2=3003750, E=6
2011-01-04JossNF-PM1
B1=50000
2010-12-28JossNF-PM1
B1=30000
2009-01-02Sturle SundeNF
no factor from 2^60 to 2^61