Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
648617Factored
FactorDigitsBitsDate
2567459824051151747992167.82008-01-24 07:14:12
ECM
DigitsB1Curves
2550000280 / 280
30250000215 / 640
Estimated T-Level: 26.7 ⓘ
TF below 2^84 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-27Oliver KruseC05D752933811C141013
Verified2017-09-28Oliver KruseC05D752933811C141013
Verified2017-11-08kkmrkkblmbrbkC05D752933811C14160478413
Unverified (Reliable)2020-04-19Oliver KruseC6362237A9DDA7__118844953
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2020-04-19Oliver KruseC-PRP
M648617/256745982405115174799 : C6362237A9DDA7__
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-11-08kkmrkkblmbrbkC-PRP
M648617/256745982405115174799 : C05D752933811C14
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-09-28Oliver KruseC-PRP
M648617/256745982405115174799 : C05D752933811C14
PRP: Unverified (Reliable)
PRP without proof (not generated)
2017-09-27Oliver KruseC-PRP
M648617/256745982405115174799 : C05D752933811C14
PRP: Unverified (Reliable)
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=1000000, B2=30000000, E=12
2008-01-24James HeinrichF-ECM
Factor: 256745982405115174799