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

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MnStatusDetails
2061331Factored
FactorDigitsBitsDate
256110597502862091532064.52015-04-21 09:19:07
12297724634325045373212270.12022-06-21 02:57:58
356554776282676760963292374.92022-04-29 08:25:30
ECM
DigitsB1Curves
2550000109 / 280
Estimated T-Level: 21.9
TF below 2^68 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Tony Neilson161C59601D9E5EDA0
Verified (Factored)1998-05-23Steinar H. Gunderson161C59601D9E5EDA0
Verified (Factored)1999-01-29Doug Wiltse161C59601D9E5EDA1715926
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-10-06Oliver KruseEF9E2F8EE38E310C1013
Verified (Factored)2017-11-15ATHEF9E2F8EE38E310C137057313
Verified (Factored)2022-04-29aperson1988BC23E3345F7DC2202584753
Verified2022-06-24_p95holder_988BC23E3345F7DC399600053
Verified2022-07-25 some-students988BC23E3345F7DC399697753
History
DateUserTypeResult
2022-07-25GhiloarCERT
PRP Certification
Proof certified good
2022-07-25 some-studentsC-PRP
M2061331/25611059750286209153/1229772463432504537321/35655477628267676096329 : 988BC23E3345F7DC
PRP proof power = 7
PRP: Verified
Proof certified good
2022-06-24_p95holder_C-PRP
M2061331/25611059750286209153/35655477628267676096329/1229772463432504537321 : 988BC23E3345F7DC
PRP: Verified
PRP without proof (not generated)
2022-06-21_p95holder_F-ECM
Factor: 1229772463432504537321 / (ECM curve 4, B1=50000, B2=5000000)
2022-04-29curtiscCERT
PRP Certification
Proof certified good
2022-04-29aperson1C-PRP
M2061331/25611059750286209153/35655477628267676096329 : 988BC23E3345F7DC
PRP proof power = 7
PRP: Verified (Factored)
Proof certified good
2022-04-29_p95holder_F-ECM
Factor: 35655477628267676096329 / (ECM curve 6, B1=50000, B2=5000000)
2022-03-09LordJuliusNF
no factor from 2^1 to 2^60
2017-11-15ATHC-PRP
M2061331/25611059750286209153 : EF9E2F8EE38E310C
PRP: Verified
PRP without proof (not generated)
2017-10-06Oliver KruseC-PRP
M2061331/25611059750286209153 : EF9E2F8EE38E310C
PRP: Verified
PRP without proof (not generated)
2016-03-16alpertronNF-PM1
B1=500000, B2=15000000, E=12
2015-04-21VictordeHollanderF
Factor: 25611059750286209153 / TF: 64-65
2015-04-21VictordeHollanderNF
no factor from 2^63 to 2^64
2014-10-26JossNF-PM1
B1=166137
2013-09-01ramgeisNF
no factor from 2^62 to 2^63
2012-03-12Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-01-21James HeinrichNF-PM1
B1=135000, B2=2902500, E=6
2011-01-06JossNF-PM1
B1=50000
2010-12-26JossNF-PM1
B1=30000
2009-06-21USAFSSNF-PM1
B1=20000, B2=260000
2009-01-02Sturle SundeNF
no factor from 2^60 to 2^61