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
97571Composite, with 4 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
4878551722.2old
419360159928.62008-08-26 20:11:53
740173607929.52008-08-26 20:11:53
69736009516871342.72008-08-26 20:11:53
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
403000000535 / 4588
Estimated T-Level: 35.6
TF below 2^113 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver KruseFBC97AF7B805EAE94013
Verified2017-10-02kkmrkkblmbrbkFBC97AF7B805EAE94013
Verified2017-12-07ATHFBC97AF7B805EAE945357813
Verified2020-04-17Oliver KruseF1DC87E03800750B41458453
Verified2024-02-03Wentao HuangF1DC87E03800750B46048153
History
DateUserTypeResult
2024-02-03Wentao HuangC-PRP
M97571/4878551/419360159/740173607/6973600951687 : F1DC87E03800750B
PRP: Verified
PRP without proof (small exponent)
2023-05-30JacobZNF-PM1
B1=1100000000, B2=1104590793816510
2021-04-30nordiNF-PP1
Start=6/5, B1=40000000, B2=2000000000
2021-04-23nordiNF-PP1
Start=2/7, B1=40000000, B2=2000000000
2020-04-17Oliver KruseC-PRP
M97571/4878551/419360159/740173607/6973600951687 : F1DC87E03800750B
PRP: Verified
PRP without proof (small exponent)
2017-12-07ATHC-PRP
M97571/4878551/419360159/740173607/6973600951687 : FBC97AF7B805EAE9
PRP: Verified
PRP without proof (small exponent)
2017-10-02kkmrkkblmbrbkC-PRP
M97571/4878551/419360159/740173607/6973600951687 : FBC97AF7B805EAE9
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M97571/known_factors : FBC97AF7B805EAE9
PRP without proof (not generated)
2017-01-10kkmrkkblmbrbkNF-PM1
B1=100000000, B2=2000000000, E=12
2008-08-26-Anonymous-F
Factor: 6973600951687
2008-08-26-Anonymous-F
Factor: 740173607
2008-08-26-Anonymous-F
Factor: 419360159