Marin Mersenne 2^P-1
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

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Exponent Range:










MnStatusDetails
390883Factored
FactorDigitsBitsDate
153566047301837782291493745459131100.32017-01-19 11:27:33
ECM
DigitsB1Curves
2550000280 / 280
30250000250 / 640
Estimated T-Level: 27.0
TF below 2^85 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Slowinski47F00
Verified (Factored)Matt Horbal6A53352974A547F00
Verified (Factored)Paul F. Bird6A53352974A547F00
Verified (Factored)Eivind Triel6A53352974A547F0130335
Verified (Factored)2016-06-01MadPoo6A53352974A547F0179837
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-23Oliver Kruse4B6D2906C8AB7A7D1013
Verified2017-11-02kkmrkkblmbrbk4B6D2906C8AB7A7D15520713
Unverified (Reliable)2020-04-18Oliver Kruse6A8AB8339B6C70__111397653
P-1 factors
DateFactorB1B2
2017-01-191535660473018377822914937454591600000003000000000
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2020-04-18Oliver KruseC-PRP
M390883/1535660473018377822914937454591 : 6A8AB8339B6C70__
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-11-02kkmrkkblmbrbkC-PRP
M390883/1535660473018377822914937454591 : 4B6D2906C8AB7A7D
PRP: Unverified (Reliable)
PRP without proof (small exponent)
2017-09-23Oliver KruseC-PRP
M390883/1535660473018377822914937454591 : 4B6D2906C8AB7A7D
PRP: Unverified (Reliable)
PRP without proof (not generated)
2017-01-19mikrF-PM1
Factor: 1535660473018377822914937454591 / (P-1, B1=60000000, B2=3000000000, E=12)
2016-06-01MadPooC-LL
6A53352974A547F0
2015-11-18Gordon SpenceNF
no factor from 2^63 to 2^64
2015-11-18Gordon SpenceNF
no factor from 2^62 to 2^63
2015-08-13NRNF
no factor from 2^61 to 2^62
2012-07-07alpertronNF-PM1
B1=10000000, B2=200000000, E=12
2011-11-11lycornNF
no factor from 2^60 to 2^61
2009-01-16Sturle SundeNF
no factor from 2^59 to 2^60
2008-12-29Sturle SundeNF
no factor from 2^58 to 2^59