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
2268793Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
49913447825.6old
285867919928.12008-07-14 20:22:35
4153276744925282631858.52012-07-09 05:45:33
ECM
DigitsB1Curves
2550000133 / 280
Estimated T-Level: 22.4
TF below 2^69 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-10Oliver Kruse128C0F66528F5DC63013
Verified2017-11-21kkmrkkblmbrbk128C0F66528F5DC63211916213
History
DateUserTypeResult
2017-11-21kkmrkkblmbrbkC-PRP
M2268793/49913447/285867919/415327674492528263 : 128C0F66528F5DC6
PRP: Verified
PRP without proof (not generated)
2017-10-10Oliver KruseC-PRP
M2268793/49913447/285867919/415327674492528263 : 128C0F66528F5DC6
PRP: Verified
PRP without proof (not generated)
2016-04-25alpertronNF-PM1
B1=500000, B2=15000000, E=12
2012-07-09dbaughF
Factor: 415327674492528263
2008-07-14George WoltmanF-ECM
Factor: 285867919