Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
238919Factored
FactorDigitsBitsDate
477839618.9old
89735090883901612910108712582.92015-01-02 14:32:33
6197423646907612509715214872789.02021-11-06 07:53:35
ECM
DigitsB1Curves
2550000280 / 280
30250000455 / 640
Estimated T-Level: 28.6 ⓘ
TF below 2^90 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2017-09-22Oliver KruseEB39C3A6EC6B98392013
Verified (Factored)2017-10-12kkmrkkblmbrbkEB39C3A6EC6B983927921013
Verified (Factored)2020-04-17Oliver Kruse610C840747C161F8215383553
Verified2021-11-06SRJ2877610C840747C161F83195653
Verified (Factored)2022-05-12Jorge Coveiro610C840747C161F8123249153
Assigned
AssignedUserWork TypeStage% DoneUpdatedExpired
2024-03-10James Heslopfactor ECM small0.00 % 2024-03-11
History
DateUserTypeResult
2022-05-12Jorge CoveiroC-PRP
M238919/477839 : 610C840747C161F8
PRP proof power = 5
PRP: Verified (Factored)
PRP proof never uploaded
2022-04-04Oliver KruseNF-PM1
B1=30000000, B2=10120247026890
2021-11-06WRCERT
PRP Certification
Proof certified good
2021-11-06SRJ2877C-PRP
M238919/477839/8973509088390161291010871/619742364690761250971521487 : 610C840747C161F8
PRP proof power = 5
PRP: Verified
Proof certified good
2021-11-06mnd9F-ECM
Factor: 619742364690761250971521487 / (ECM curve 1, B1=250000, B2=25000000, Sigma=1425669339748106)
2021-07-16Oliver KruseNF-PM1
B1=30000000, B2=3000000000, E=24
2020-04-17Oliver KruseC-PRP
M238919/477839/8973509088390161291010871 : 610C840747C161F8
PRP: Verified (Factored)
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M238919/477839/8973509088390161291010871 : EB39C3A6EC6B9839
PRP: Verified (Factored)
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M238919/477839/8973509088390161291010871 : EB39C3A6EC6B9839
PRP: Verified (Factored)
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M238919/477839/8973509088390161291010871 : EB39C3A6EC6B9839
PRP without proof (not generated)
2015-01-02TJAOIF-ECM
Factor: 8973509088390161291010871 / (ECM curve 29, B1=50000, B2=5000000)