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
2256847Factored
FactorDigitsBitsDate
1950494689255511547.5old
21964914119395333680472270.92022-11-10 10:42:30
ECM
DigitsB1Curves
255000091 / 280
Estimated T-Level: 21.6 ⓘ
TF below 2^67 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2017-10-10Oliver Kruse3DF6071F0B000C1D1013
Verified (Factored)2017-11-21ATH3DF6071F0B000C1D1144053013
Verified2022-11-15LordJulius7C26EF76A6C0B74F2182016253
History
DateUserTypeResult
2022-11-15ChelleCERT
PRP Certification
Proof certified good
2022-11-15LordJuliusC-PRP
M2256847/195049468925551/2196491411939533368047 : 7C26EF76A6C0B74F
PRP proof power = 7
PRP: Verified
Proof certified good
2022-11-10_p95holder_F-ECM
Factor: 2196491411939533368047 / (ECM curve 3, B1=50000, B2=5000000)
2017-11-21ATHC-PRP
M2256847/195049468925551 : 3DF6071F0B000C1D
PRP: Verified (Factored)
PRP without proof (not generated)
2017-10-10Oliver KruseC-PRP
M2256847/195049468925551 : 3DF6071F0B000C1D
PRP: Verified (Factored)
PRP without proof (not generated)
2016-04-12alpertronNF-PM1
B1=500000, B2=15000000, E=12