Marin Mersenne 2^P-1
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GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

Exponent Range:










MnStatusDetails
7681Composite, with 3 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
3994121721.9old
5339358050411239.0old
12453671043464738631960.1old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000004588 / 4588
45110000002047 / 9201
Estimated T-Level: 41.1
TF below 2^132 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver KruseF3382A59A39CC5023013
Verified2017-10-02kkmrkkblmbrbkF3382A59A39CC5023013
Verified2017-12-07ATHF3382A59A39CC5023104313
Verified2020-04-17Oliver KruseC369F510E9F937943429953
Verified2024-02-03Wentao HuangC369F510E9F93794312753
History
DateUserTypeResult
2024-12-10yuriy5-1NF-PM1
B1=24000000000, B2=93848103835646160
2024-02-03Wentao HuangC-PRP
M7681/3994121/533935805041/1245367104346473863 : C369F510E9F93794
PRP: Verified
PRP without proof (small exponent)
2021-07-08ViliamFNF-PM1
B1=1000000000, B2=201000000000
2020-04-17Oliver KruseC-PRP
M7681/3994121/533935805041/1245367104346473863 : C369F510E9F93794
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M7681/3994121/533935805041/1245367104346473863 : F3382A59A39CC502
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M7681/3994121/533935805041/1245367104346473863 : F3382A59A39CC502
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M7681/known_factors : F3382A59A39CC502
PRP without proof (not generated)