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

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MnStatusDetails
428899Factored
FactorDigitsBitsDate
12512124365350610864082702180387858497725688945146.52013-01-09 10:10:16
ECM
DigitsB1Curves
2550000280 / 280
30250000210 / 640
Estimated T-Level: 26.6 ⓘ
TF below 2^83 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Slowinski1E5F0
Verified (Factored)Jay R. Hill0F3659F959BB5E5F0
Verified (Factored)Eivind Triel0F3659F959BB5E5F77686
Verified (Factored)2002-02-17Dennis Pope0F3659F959BB5E5F213803
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-23Oliver Kruse846DFB9AC6B689531013
Verified2017-09-24Oliver Kruse846DFB9AC6B689531013
Verified2017-11-07kkmrkkblmbrbk846DFB9AC6B68953115415113
Unverified (Reliable)2020-04-18Oliver Kruse6C68C3459AC18D__16199253
P-1 factors
DateFactorB1B2
2013-01-09125121243653506108640827021803878584977256889250000001000000000
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^58 to 2^60
2020-04-18Oliver KruseC-PRP
M428899/125121243653506108640827021803878584977256889 : 6C68C3459AC18D__
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-11-07kkmrkkblmbrbkC-PRP
M428899/125121243653506108640827021803878584977256889 : 846DFB9AC6B68953
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-09-23Oliver KruseC-PRP
M428899/125121243653506108640827021803878584977256889 : 846DFB9AC6B68953
PRP: Unverified (Reliable)
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=3000000, B2=100000000, E=12
2013-01-09markrF-PM1
Factor: 125121243653506108640827021803878584977256889
2012-12-01dbaughNF
no factor from 2^61 to 2^62
2012-11-27dbaughNF
no factor from 2^60 to 2^61
2012-05-29JossNF-PM1
B1=2987030
2010-08-05Rob_DeeNF-PM1
B1=1000000, B2=2000000, E=6
2010-08-04Rob_DeeNF-PM1
B1=500000, B2=1000000