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

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MnStatusDetails
4396423Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
3855926756391238.5old
15971845216009921611960.52016-02-10 12:12:54
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
Verified2017-09-20kkmrkkblmbrbkB19B1E5D92E012FF2013
Verified2018-02-08treborB19B1E5D92E012FF2268271513
History
DateUserTypeResult
2023-06-05USAFSSNF-PM1
B1=336000, B2=179978370
2018-02-08treborC-PRP
M4396423/385592675639/1597184521600992161 : B19B1E5D92E012FF
PRP: Verified
PRP without proof (not generated)
2017-09-20kkmrkkblmbrbkC-PRP
M4396423/1597184521600992161/385592675639 : B19B1E5D92E012FF
PRP: Verified
PRP without proof (not generated)
2016-02-10TJAOIF
Factor: 1597184521600992161 / TF: 60-61