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
2180537Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
206366021691134.3old
68269996825611342.62008-07-14 20:21:41
ECM
DigitsB1Curves
2550000280 / 280
30250000199 / 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
Verified2017-10-09Oliver Kruse58D02FE64A5C645C2013
Verified2017-11-19kkmrkkblmbrbk58D02FE64A5C645C2216677513
History
DateUserTypeResult
2017-11-19kkmrkkblmbrbkC-PRP
M2180537/20636602169/6826999682561 : 58D02FE64A5C645C
PRP: Verified
PRP without proof (not generated)
2017-10-09Oliver KruseC-PRP
M2180537/20636602169/6826999682561 : 58D02FE64A5C645C
PRP: Verified
PRP without proof (not generated)
2016-03-21alpertronNF-PM1
B1=500000, B2=15000000, E=12
2008-07-14George WoltmanF-ECM
Factor: 6826999682561