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
19681Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
213168453591134.3old
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000003431 / 4588
Estimated T-Level: 38.7
TF below 2^124 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver KruseA6E9E20882259A4D1013
Verified2017-10-12kkmrkkblmbrbkA6E9E20882259A4D1137513
Verified2020-04-17Oliver Kruse7BF5D0F7358074BA1577153
Verified2024-07-01kkmrkkblmbrbk7BF5D0F7358074BA11613853
History
DateUserTypeResult
2025-01-02masserNF-PP1
Start=110/11, B1=132000000, B2=131868000000
2024-12-25masserNF-PP1
Start=2/7, B1=132000000, B2=131868000000
2024-12-19masserNF-PP1
Start=6/5, B1=132000000, B2=131868000000
2024-07-01kkmrkkblmbrbkC-PRP
M19681/21316845359 : 7BF5D0F7358074BA
PRP: Verified
PRP without proof (small exponent)
2023-05-16JacobZNF-PM1
B1=5300000000, B2=15580930497522390
2022-02-06Lisander ViaeneNF-PM1
B1=50000
2020-04-17Oliver KruseC-PRP
M19681/21316845359 : 7BF5D0F7358074BA
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M19681/21316845359 : A6E9E20882259A4D
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M19681/21316845359 : A6E9E20882259A4D
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M19681/21316845359 : A6E9E20882259A4D
PRP without proof (not generated)