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
1263461Factored
FactorDigitsBitsDate
39520772220399103031961.82011-05-09 14:41:57
ECM
DigitsB1Curves
2550000280 / 280
30250000100 / 640
Estimated T-Level: 25.8 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David SlowinskiCC40
Verified (Factored)Robert Clark9CEB4C1B99A22CC40
Verified (Factored)2002-08-31Mark Outhier9CEB4C1B99A22CC4381266
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-29Oliver Kruse4D10E49A159230451013
Verified2017-10-21kkmrkkblmbrbk4D10E49A1592304514976713
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^58 to 2^60
2017-10-21kkmrkkblmbrbkC-PRP
M1263461/3952077222039910303 : 4D10E49A15923045
PRP: Verified
PRP without proof (not generated)
2017-09-29Oliver KruseC-PRP
M1263461/3952077222039910303 : 4D10E49A15923045
PRP: Verified
PRP without proof (not generated)
2011-05-09XyzzyF-ECM
Factor: 3952077222039910303
2009-02-15Sturle SundeNF
no factor from 2^60 to 2^61