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
1216961Factored
FactorDigitsBitsDate
207655145650232759592064.22013-12-18 10:28:28
ECM
DigitsB1Curves
2550000280 / 280
30250000104 / 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 Slowinski3CC0
Verified (Factored)John LyonEB470D5F81B003CC0
Verified (Factored)2002-08-10Mark OuthierEB470D5F81B003CC390187
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-29Oliver Kruse93A7D6F998A53BD11013
Verified2017-10-18Oliver Kruse93A7D6F998A53BD1115649913
Verified2018-01-03ATH93A7D6F998A53BD1171459013
History
DateUserTypeResult
2022-04-13LordJuliusNF
no factor from 2^63 to 2^64
2022-04-13LordJuliusNF
no factor from 2^62 to 2^63
2022-04-13LordJuliusNF
no factor from 2^61 to 2^62
2022-04-13LordJuliusNF
no factor from 2^1 to 2^61
2022-03-07LordJuliusNF
no factor from 2^58 to 2^60
2018-01-03ATHC-PRP
M1216961/20765514565023275959 : 93A7D6F998A53BD1
PRP: Verified
PRP without proof (not generated)
2017-10-18Oliver KruseC-PRP
M1216961/20765514565023275959 : 93A7D6F998A53BD1
PRP: Verified
PRP without proof (not generated)
2017-09-29Oliver KruseC-PRP
M1216961/20765514565023275959 : 93A7D6F998A53BD1
PRP: Verified
PRP without proof (not generated)
2016-03-17alpertronNF-PM1
B1=300000, B2=10000000, E=12
2013-12-18jim f in mnF-ECM
Factor: 20765514565023275959
2013-10-07David CampeauNF-PM1
B1=1205000, B2=34945000, E=12
2012-10-13dbaughNF
no factor from 2^62 to 2^63
2011-05-09XyzzyNF
no factor from 2^61 to 2^62
2009-02-17Sturle SundeNF
no factor from 2^60 to 2^61