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
2857Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
3679817721.8old
2849127832199511548.0old
476418285237032891755.4old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000009201 / 9201
50440000002925 / 16550
Estimated T-Level: 45.9
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 Kruse12C43DB5D333BCB23013
Verified2017-10-02kkmrkkblmbrbk12C43DB5D333BCB23013
Verified2017-12-07ATH12C43DB5D333BCB23266313
Verified2020-04-17Oliver Kruse53F1FFF718EB992F3142053
Verified2024-02-03Wentao Huang53F1FFF718EB992F3158853
History
DateUserTypeResult
2024-02-03Wentao HuangC-PRP
M2857/3679817/284912783219951/47641828523703289 : 53F1FFF718EB992F
PRP: Verified
PRP without proof (small exponent)
2022-02-23mikrNF-PM1
B1=60000000000, B2=314806422904433460
2021-07-07ViliamFNF-PM1
B1=1000000000, B2=191000000000
2020-04-17Oliver KruseC-PRP
M2857/3679817/284912783219951/47641828523703289 : 53F1FFF718EB992F
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M2857/3679817/284912783219951/47641828523703289 : 12C43DB5D333BCB2
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M2857/3679817/284912783219951/47641828523703289 : 12C43DB5D333BCB2
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M2857/known_factors : 12C43DB5D333BCB2
PRP without proof (not generated)