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
6491Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
12983513.7old
69440719826.0old
122969788071133.5old
9543884508171239.8old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000001299 / 9201
Estimated T-Level: 40.7
TF below 2^130 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver KruseC42B47708B3432264013
Verified2017-10-12kkmrkkblmbrbkC42B47708B343226429713
Verified2020-04-17Oliver Kruse33D51B6802974C67463853
Verified (Factored)2022-05-12Jorge Coveiro33D51B6802974C67139153
Verified2024-02-03Wentao Huang33D51B6802974C674308853
History
DateUserTypeResult
2024-02-03Wentao HuangC-PRP
M6491/12983/69440719/12296978807/954388450817 : 33D51B6802974C67
PRP: Verified
PRP without proof (small exponent)
2023-08-08-Anonymous-NF-PM1
B1=38000000000, B2=159095079570076650
2022-05-12Jorge CoveiroC-PRP
M6491/12983 : 33D51B6802974C67
PRP: Verified
PRP without proof (small exponent)
2021-12-17Oliver KruseNF-PM1
B1=1000000000, B2=1006397938886340
2020-04-17Oliver KruseC-PRP
M6491/12983/69440719/12296978807/954388450817 : 33D51B6802974C67
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M6491/12983/69440719/12296978807/954388450817 : C42B47708B343226
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M6491/12983/69440719/12296978807/954388450817 : C42B47708B343226
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M6491/12983/69440719/12296978807/954388450817 : C42B47708B343226
PRP without proof (not generated)