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

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MnStatusDetails
2383571Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
4767143722.2old
419508497928.62008-07-14 20:23:29
ECM
DigitsB1Curves
2550000140 / 280
Estimated T-Level: 22.5
TF below 2^70 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-12Oliver Kruse65D4F07567FCCE0F227873653
Verified2017-11-25kkmrkkblmbrbk65D4F07567FCCE0F222429253
History
DateUserTypeResult
2018-09-28alpertronNF-PM1
B1=2000000, B2=60000000, E=12
2017-11-25kkmrkkblmbrbkC-PRP
M2383571/4767143/419508497 : 65D4F07567FCCE0F
PRP: Verified
PRP without proof (not generated)
2017-10-12Oliver KruseC-PRP
M2383571/4767143/419508497 : 65D4F07567FCCE0F
PRP: Verified
PRP without proof (not generated)
2008-07-14George WoltmanF-ECM
Factor: 419508497