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
81331Factored
FactorDigitsBitsDate
1475786795279591547.1old
2042068813201971184099560779979815518338123.92022-01-23 18:52:43
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000706 / 1566
Estimated T-Level: 32.3 ⓘ
TF below 2^102 is very unlikely to find new factors due to ECM effort.
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified (Factored)2017-09-21Oliver Kruse60D3194D49141CBA1013
Verified (Factored)2017-10-13kkmrkkblmbrbk60D3194D49141CBA14579013
Verified (Factored)2020-04-17Oliver Kruse4433D507D613E74013334453
Verified2022-01-23mikr4433D507D613E7402808053
Assigned
AssignedUserWork TypeStage% DoneUpdatedExpired
2024-04-23masserfactor ECM small0.00 % 2024-04-25
P-1 factors
DateFactorB1B2
2022-01-2320420688132019711840995607799798155183100000000020529978118650
History
DateUserTypeResult
2024-01-27masserNF-PP1
Start=6/5, B1=25000000, B2=1475000000
2024-01-27masserNF-PP1
Start=170/67, B1=25000000, B2=1475000000
2024-01-24masserNF-PP1
Start=2/7, B1=25000000, B2=1475000000
2022-01-23mikrC-PRP
M81331/147578679527959/20420688132019711840995607799798155183 : 4433D507D613E740
PRP: Verified
PRP without proof (small exponent)
2022-01-23George WoltmanF-PM1
Factor: 20420688132019711840995607799798155183 / (P-1, B1=1000000000, B2=20529978118650)
2020-04-17Oliver KruseC-PRP
M81331/147578679527959 : 4433D507D613E740
PRP: Verified
PRP without proof (small exponent)
2017-10-13kkmrkkblmbrbkC-PRP
M81331/147578679527959 : 60D3194D49141CBA
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M81331/147578679527959 : 60D3194D49141CBA
PRP: Verified
PRP without proof (not generated)
2017-09-21Oliver KruseC-PRP
M81331/147578679527959 : 60D3194D49141CBA
PRP without proof (not generated)
2016-10-31kkmrkkblmbrbkNF-PM1
B1=100000000, B2=2000000000, E=12