Marin Mersenne 2^P-1
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MnStatusDetails
3255437Factored
FactorDigitsBitsDate
206154996127588780910954872684.12021-04-03 00:09:56
ECM
DigitsB1Curves
255000039 / 280
Estimated T-Level: 20.7
TF below 2^64 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)1998-02-08Terry S. Arnold7B41A2EFBA6FD1E30
Verified (Factored)1999-06-26Jan P. Finegan7B41A2EFBA6FD1E3193051
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2021-04-03Kirill FrolovF5067A795B39F9981249903053
Verified2021-04-04XZTF5067A795B39F998136436253
History
DateUserTypeResult
2022-09-12JossNF-PM1
B1=1000000, B2=241152450
2022-03-24JossNF-PM1
B1=1000000, B2=134316000
2021-04-04Theo P.CERT
PRP Certification
Proof certified good
2021-04-04XZTC-PRP
M3255437/20615499612758878091095487 : F5067A795B39F998
PRP proof power = 7
PRP: Verified
Proof certified good
2021-04-03CyarraCERT
PRP Certification
Proof certified good
2021-04-03Kirill FrolovC-PRP
M3255437/20615499612758878091095487 : F5067A795B39F998
PRP proof power = 7
PRP: Verified
Proof certified good
2021-04-03mnd9F-ECM
Factor: 20615499612758878091095487 / (ECM curve 5, B1=50000, B2=5000000, Sigma=918546068399949)
2021-02-07ViliamFNF
no factor from 2^68 to 2^69
2020-08-12mikrNF-PM1
B1=4000000, B2=150000000, E=12
2019-01-07TJAOINF
no factor from 2^67 to 2^68
2017-03-29Gordon SpenceNF
no factor from 2^66 to 2^67
2016-01-17JossNF-PM1
B1=415800, B2=4158000, E=6
2015-06-28ThaNF
no factor from 2^65 to 2^66
2015-02-18VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-18VictordeHollanderNF
no factor from 2^63 to 2^64
2014-10-07JossNF-PM1
B1=99432
2014-06-11JossNF-PM1
B1=79716
2013-01-03dbaughNF
no factor from 2^62 to 2^63
2011-09-18markrNF
no factor to 2^62
2011-09-12USAFSSNF-PM1
B1=60000, B2=1050000, E=6
2009-07-05Carsten KossendeyNF-PM1
B1=15000, B2=191250
2009-04-04S485122NF
no factor from 2^60 to 2^61