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

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MnStatusDetails
256471Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
84635431826.3old
114899009926.82008-07-21 09:15:07
544671116611560491755.62015-01-02 14:31:54
126274317066211854432654584712993.42016-03-11 13:48:13
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000165 / 1566
Estimated T-Level: 30.5
TF below 2^96 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-22Oliver KruseB7C22A7873C1C5DD4013
Verified2017-10-12Oliver KruseB7C22A7873C1C5DD45804313
Verified2017-11-06kkmrkkblmbrbkB7C22A7873C1C5DD46894013
Verified2020-04-17Oliver Kruse91D13761BBBC4EF949524453
Verified2024-02-03Wentao Huang91D13761BBBC4EF945508253
History
DateUserTypeResult
2024-02-03Naegi MakotoCERT
PRP Certification
Proof certified good
2024-02-03Wentao HuangC-PRP
M256471/84635431/114899009/54467111661156049/12627431706621185443265458471 : 91D13761BBBC4EF9
PRP proof power = 5
PRP: Verified
Proof certified good
2022-04-27Oliver KruseNF-PM1
B1=30000000, B2=10035812696910
2021-09-08Oliver KruseNF-PM1
B1=30000000, B2=3000000000, E=24
2021-07-03George WoltmanNF-PP1
Start=2/7, B1=10000000, B2=830000000
2021-07-03George WoltmanNF-PM1
B1=20000000, B2=1820000000
2020-04-17Oliver KruseC-PRP
M256471/84635431/114899009/54467111661156049/12627431706621185443265458471 : 91D13761BBBC4EF9
PRP: Verified
PRP without proof (small exponent)
2017-11-06kkmrkkblmbrbkC-PRP
M256471/84635431/114899009/54467111661156049/12627431706621185443265458471 : B7C22A7873C1C5DD
PRP: Verified
PRP without proof (small exponent)
2017-10-12Oliver KruseC-PRP
M256471/84635431/114899009/54467111661156049/12627431706621185443265458471 : B7C22A7873C1C5DD
PRP: Verified
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M256471/known_factors : B7C22A7873C1C5DD
PRP without proof (not generated)
2016-03-11TJAOIF-ECM
Factor: 12627431706621185443265458471 / (ECM curve 150, B1=50000, B2=5000000)
2015-01-02TJAOIF-ECM
Factor: 54467111661156049 / (ECM curve 2, B1=50000, B2=5000000)
2008-07-21J FeitsmaF
Factor: 114899009