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

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MnStatusDetails
2597897Factored
FactorDigitsBitsDate
26993872665818567530312271.22021-02-05 01:29:07
ECM
DigitsB1Curves
255000093 / 280
Estimated T-Level: 21.7
TF below 2^67 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Cliff Wichmann1A61365A4A704D970
Verified (Factored)1999-04-02Andrew Haveland-Robinson1A61365A4A704D971850293
Verified (Factored)2018-06-25kkmrkkblmbrbk1A61365A4A704D972443350
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2021-02-05ViliamF4B8FF88CAA2A7A5B1196440853
History
DateUserTypeResult
2021-02-05Ben DeloCERT
PRP Certification
Proof certified good
2021-02-05ViliamFC-PRP
M2597897/2699387266581856753031 : 4B8FF88CAA2A7A5B
PRP proof power = 7
PRP: Verified
Proof certified good
2021-02-05MarkSF-ECM
Factor: 2699387266581856753031 / (ECM curve 11, B1=50000, B2=5000000, Sigma=952043341197106)
2019-03-18TJAOINF
no factor from 2^67 to 2^68
2018-06-25kkmrkkblmbrbkC-LL
1A61365A4A704D97
2017-08-21Gordon SpenceNF
no factor from 2^66 to 2^67
2016-08-29mikrNF-PM1
B1=3200000, B2=112000000, E=12
2016-02-23Mark RoseNF
no factor from 2^59 to 2^60
2015-11-08ramgeisNF
no factor from 2^65 to 2^66
2015-02-27VictordeHollanderNF
no factor from 2^64 to 2^65
2015-02-27VictordeHollanderNF
no factor from 2^63 to 2^64
2013-01-14dbaughNF
no factor from 2^62 to 2^63
2012-06-23Sebastian HornbostelNF
no factor from 2^61 to 2^62
2011-04-18James HeinrichNF-PM1
B1=175000, B2=4156250, E=6
2011-01-15JossNF-PM1
B1=50000
2010-11-16JossNF-PM1
B1=20000
2009-01-30Sturle SundeNF
no factor from 2^60 to 2^61