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

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MnStatusDetails
3998789Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
287912809928.1old
6248063585893671549.22014-04-24 10:21:00
ECM
DigitsB1Curves
25500003 / 280
Estimated T-Level: 20.1
TF below 2^62 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-20kkmrkkblmbrbk01FAF65DA472FD502013
Verified2018-01-05Oliver Kruse01FAF65DA472FD50272605713
History
DateUserTypeResult
2022-05-23JossNF-PM1
B1=200000, B2=113097600
2022-02-25JossNF-PM1
B1=200000
2022-01-31JossNF
no factor from 2^67 to 2^68
2020-06-19JossNF-PM1
B1=399878, B2=3998789, E=6
2020-06-10JossNF-PM1
B1=399878
2018-01-05Oliver KruseC-PRP
M3998789/287912809/624806358589367 : 01FAF65DA472FD50
PRP: Verified
PRP without proof (not generated)
2017-09-20kkmrkkblmbrbkC-PRP
M3998789/287912809/624806358589367 : 01FAF65DA472FD50
PRP: Verified
PRP without proof (not generated)
2014-04-24TJAOIF
Factor: 624806358589367