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
2238569Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
494052178311135.5old
64603519565872831119283912582.42016-04-22 11:30:27
ECM
DigitsB1Curves
2550000280 / 280
30250000152 / 640
Estimated T-Level: 26.2
TF below 2^82 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-30alpertron5173FC577B9625DA2013
Verified2017-10-28Oliver Kruse5173FC577B9625DA296521113
P-1 factors
DateFactorB1B2
2016-04-22646035195658728311192839150000015000000
History
DateUserTypeResult
2021-07-01Dylan DelgadoNF-PM1
B1=1000000, B2=106000000
2017-10-28Oliver KruseC-PRP
M2238569/49405217831/6460351956587283111928391 : 5173FC577B9625DA
PRP: Verified
PRP without proof (not generated)
2017-09-30alpertronC-PRP
M2238569/49405217831/6460351956587283111928391 : 5173FC577B9625DA
PRP: Verified
PRP without proof (not generated)
2016-04-22alpertronF-PM1
Factor: 6460351956587283111928391 / (P-1, B1=500000, B2=15000000, E=12)