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:





MnDetails
2278831
Composite, with 3 known prime factors. Cofactor is composite.
Trial Factored to 268
TF target 262
Factored
FactorDigitsBitsDate
121233809211133.5old
3733349030774571548.42008-09-30 14:36:46
43310400782528792473512271.92016-04-08 21:48:20
P-1 factors
DateFactorsB1B2
2016-04-084331040078252879247351
50000015000000
ECM
DigitsB1Curves
2550000280 / 280
30250000117 / 640
Estimated T-Level: 25.9 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusProofDateUserResidueNumber of
known factors		ShiftTypeBase
Factored
PRP without proof (not generated)
2017-10-11Oliver KruseB0243F86E07DB1C21013
Verified
PRP without proof (not generated)
2017-10-18Oliver KruseB86ADEDC9A990ADA34682753
Verified
PRP without proof (not generated)
2017-11-22storm5510B86ADEDC9A990ADA3227497753
History
DateUserTypeResult
2017-11-22storm5510C-PRPM2278831/12123380921/373334903077457/4331040078252879247351 : B86ADEDC9A990ADA
2017-10-18Oliver KruseC-PRPM2278831/12123380921/373334903077457/4331040078252879247351 : B86ADEDC9A990ADA
2017-10-11Oliver KruseC-PRPM2278831/known_factors : B0243F86E07DB1C2
2016-04-08alpertronF-PM1Factor: 4331040078252879247351 / B1=500000, B2=15000000
2008-09-30markrFFactor: 373334903077457