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
7817Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
851648821702331446.3old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
50440000002301 / 16550
Estimated T-Level: 45.7
TF below 2^147 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver KruseE33515F2EE9A880C1013
Verified2017-10-12kkmrkkblmbrbkE33515F2EE9A880C1439813
Verified2020-04-17Oliver KruseB75ED61F80197E3E1391253
Verified2024-02-03Wentao HuangB75ED61F80197E3E1654253
History
DateUserTypeResult
2024-02-03Wentao HuangC-PRP
M7817/85164882170233 : B75ED61F80197E3E
PRP: Verified
PRP without proof (small exponent)
2021-07-09ViliamFNF-PM1
B1=1000000000, B2=201000000000
2020-04-17Oliver KruseC-PRP
M7817/85164882170233 : B75ED61F80197E3E
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M7817/85164882170233 : E33515F2EE9A880C
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M7817/85164882170233 : E33515F2EE9A880C
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M7817/85164882170233 : E33515F2EE9A880C
PRP without proof (not generated)