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

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MnStatusDetails
2152291Factored
FactorDigitsBitsDate
5481387441614307083112168.92020-03-01 00:49:58
ECM
DigitsB1Curves
255000057 / 280
Estimated T-Level: 21.0
TF below 2^65 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)James Gant45E4CD90C2AD77970
Verified (Factored)1999-02-21Jeff Malick45E4CD90C2AD7797763600
Verified (Factored)2018-04-09kkmrkkblmbrbk45E4CD90C2AD7797558054
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2020-03-01Christoph ZengerC961EAE811986D1A1207373453
Verified2020-03-04Alvin BunkC961EAE811986D1A1116084753
History
DateUserTypeResult
2020-03-04Alvin BunkC-PRP
M2152291/548138744161430708311 : C961EAE811986D1A
PRP: Verified
PRP without proof (not generated)
2020-03-01Christoph ZengerC-PRP
M2152291/548138744161430708311 : C961EAE811986D1A
PRP: Verified
PRP without proof (not generated)
2020-03-01MarkSF-ECM
Factor: 548138744161430708311 / (ECM curve 1, B1=50000, B2=5000000, Sigma=8291593589421206)
2019-05-20TJAOINF
no factor from 2^67 to 2^68
2018-04-09kkmrkkblmbrbkC-LL
45E4CD90C2AD7797
2017-12-11mikrNF-PM1
B1=2500000, B2=125000000, E=12
2017-11-14JossNF-PM1
B1=648000, B2=10950018, E=12
2017-10-04JossNF-PM1
B1=540000, B2=5400000, E=6
2016-11-03Gordon SpenceNF
no factor from 2^66 to 2^67
2016-05-01JossNF-PM1
B1=270000, B2=9954562, E=12
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-12-30ramgeisNF
no factor from 2^65 to 2^66
2015-03-22VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-22VictordeHollanderNF
no factor from 2^63 to 2^64
2013-09-08ramgeisNF
no factor from 2^62 to 2^63
2011-01-24James HeinrichNF-PM1
B1=135000, B2=2666250, E=6
2011-01-15JossNF-PM1
B1=50000
2010-12-30JossNF-PM1
B1=30000
2010-11-03JossNF-PM1
B1=20000
2009-01-08Sturle SundeNF
no factor from 2^61 to 2^62
2009-01-04Sturle SundeNF
no factor from 2^60 to 2^61