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
5383853Factored
FactorDigitsBitsDate
975858934565197815132066.42015-02-22 16:59:23
ECM
DigitsB1Curves
25500005 / 280
Estimated T-Level: 20.1 ⓘ
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)1998-09-27Fred MinkemaAE3330138EF455FE0
Verified (Factored)1998-09-27minkemafAE3330138EF455FE0
Verified (Factored)2002-02-03Tijn DelhaesAE3330138EF455FE2218468
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-11-29treborA475FACB558274891173059953
Verified2018-02-26kkmrkkblmbrbkA475FACB558274891387495153
History
DateUserTypeResult
2018-02-26kkmrkkblmbrbkC-PRP
M5383853/97585893456519781513 : A475FACB55827489
PRP: Verified
PRP without proof (not generated)
2017-11-29treborC-PRP
M5383853/97585893456519781513 : A475FACB55827489
PRP: Verified
PRP without proof (not generated)
2015-02-22Sid & AndyF-ECM
Factor: 97585893456519781513
2014-12-25VictordeHollanderNF
no factor from 2^64 to 2^65
2014-12-25VictordeHollanderNF
no factor from 2^63 to 2^64
2010-10-09Squeeky_SquirrelNF-PM1
B1=60000, B2=960000, E=6
2009-08-22Carsten KossendeyNF-PM1
B1=25000, B2=350000
2009-05-19GrunwalderGIMPNF
no factor from 2^62 to 2^63