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
27581Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
243154097927.9old
3321390296712472071858.22008-08-26 19:59:16
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
3510000001566 / 1566
4030000001906 / 4588
Estimated T-Level: 37.1
TF below 2^118 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-21Oliver Kruse29D2530D038374BC2013
Verified2017-10-12kkmrkkblmbrbk29D2530D038374BC2121713
Verified2020-04-17Oliver Kruse2515283CEDB32D5B22053253
Verified2024-07-01kkmrkkblmbrbk2515283CEDB32D5B2660353
Assigned
AssignedUserWork TypeStage% DoneUpdatedExpired
2025-10-10masserfactor ECM small0.00 % 2025-10-12
History
DateUserTypeResult
2024-11-25masserNF-PP1
Start=6/5, B1=100000000, B2=99900000000
2024-11-16masserNF-PP1
Start=2/7, B1=100000000, B2=99900000000
2024-11-11masserNF-PP1
Start=147/61, B1=100000000, B2=99900000000
2024-07-01kkmrkkblmbrbkC-PRP
M27581/243154097/332139029671247207 : 2515283CEDB32D5B
PRP: Verified
PRP without proof (small exponent)
2023-03-18nordiNF-PM1
B1=5000000000, B2=1516930270635780
2022-12-30nordiNF-PM1
B1=5000000000
2020-04-17Oliver KruseC-PRP
M27581/243154097/332139029671247207 : 2515283CEDB32D5B
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M27581/243154097/332139029671247207 : 29D2530D038374BC
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M27581/243154097/332139029671247207 : 29D2530D038374BC
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M27581/243154097/332139029671247207 : 29D2530D038374BC
PRP without proof (not generated)
2016-12-21kkmrkkblmbrbkNF-PM1
B1=500000000, B2=10000000000, E=12
2008-08-26-Anonymous-F-ECM
Factor: 332139029671247207