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
2253487Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
157248322871133.9old
1585553453211237.22008-07-14 20:22:24
ECM
DigitsB1Curves
2550000280 / 280
30250000202 / 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
Verified2017-10-10Oliver KruseA42027FB9E20115E2013
Verified2017-11-21ATHA42027FB9E20115E2108257613
History
DateUserTypeResult
2017-11-21ATHC-PRP
M2253487/15724832287/158555345321 : A42027FB9E20115E
PRP: Verified
PRP without proof (not generated)
2017-10-10Oliver KruseC-PRP
M2253487/15724832287/158555345321 : A42027FB9E20115E
PRP: Verified
PRP without proof (not generated)
2016-04-08alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-07-14George WoltmanF-ECM
Factor: 158555345321