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
2162071Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
4366807833458391548.6old
663642499852768071755.92015-02-20 12:28:45
ECM
DigitsB1Curves
2550000280 / 280
30250000169 / 640
Estimated T-Level: 26.3
TF below 2^82 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-09Oliver Kruse9D6F4D53DD6DACC62013
Verified2017-11-18kkmrkkblmbrbk9D6F4D53DD6DACC62202114613
History
DateUserTypeResult
2017-11-18kkmrkkblmbrbkC-PRP
M2162071/436680783345839/66364249985276807 : 9D6F4D53DD6DACC6
PRP: Verified
PRP without proof (not generated)
2017-10-09Oliver KruseC-PRP
M2162071/436680783345839/66364249985276807 : 9D6F4D53DD6DACC6
PRP: Verified
PRP without proof (not generated)
2016-04-03alpertronNF-PM1
B1=500000, B2=15000000, E=12
2015-02-20TJAOIF
Factor: 66364249985276807 / TF: 55-56