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
2176397Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
123967573131133.5old
ECM
DigitsB1Curves
2550000280 / 280
30250000209 / 640
Estimated T-Level: 26.6
TF below 2^83 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-10kkmrkkblmbrbkA7CA2F0E466341321013
Verified2017-10-23Oliver KruseA7CA2F0E4663413212321813
History
DateUserTypeResult
2017-10-23Oliver KruseC-PRP
M2176397/12396757313 : A7CA2F0E46634132
PRP: Verified
PRP without proof (not generated)
2017-10-10kkmrkkblmbrbkC-PRP
M2176397/12396757313 : A7CA2F0E46634132
PRP: Verified
PRP without proof (not generated)
2016-03-15alpertronNF-PM1
B1=500000, B2=15000000, E=12