Marin Mersenne 2^P-1
Username
Password
Forgot password?
Black
Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
31223Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
30785879824.9old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000002512 / 4588
Estimated T-Level: 37.7
TF below 2^120 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse6384C2BF8597D98E1013
Verified2017-10-12kkmrkkblmbrbk6384C2BF8597D98E1319313
Verified2020-04-17Oliver Kruse7C447365DB7D05021369453
Verified2024-07-01kkmrkkblmbrbk7C447365DB7D050212473653
History
DateUserTypeResult
2025-01-06masserNF-PP1
Start=6/5, B1=80000000, B2=79920000000
2024-12-27masserNF-PP1
Start=195/61, B1=80000000, B2=79920000000
2024-12-17masserNF-PP1
Start=2/7, B1=80000000, B2=79920000000
2024-07-01kkmrkkblmbrbkC-PRP
M31223/30785879 : 7C447365DB7D0502
PRP: Verified
PRP without proof (small exponent)
2022-10-22nordiNF-PM1
B1=3000000000, B2=931568354076360
2022-10-01nordiNF-PM1
B1=3000000000
2020-04-17Oliver KruseC-PRP
M31223/30785879 : 7C447365DB7D0502
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M31223/30785879 : 6384C2BF8597D98E
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M31223/30785879 : 6384C2BF8597D98E
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M31223/30785879 : 6384C2BF8597D98E
PRP without proof (not generated)
2016-10-08kkmrkkblmbrbkNF-PM1
B1=200000000, B2=5000000000, E=12