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
5051987Factored
FactorDigitsBitsDate
642851786661611241788472375.82021-11-01 20:01:39
ECM
DigitsB1Curves
255000045 / 280
Estimated T-Level: 20.8
TF below 2^64 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Joe Brunetto817301AF558CF31B0
Verified (Factored)1998-06-28Thomas Honold817301AF558CF31B0
Verified (Factored)2000-04-12The Prime Hunters817301AF558CF31B5007990
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2021-11-02ATH5B6450C42D203CFA1153150753
History
DateUserTypeResult
2021-11-02mitchsherwinCERT
PRP Certification
Proof certified good
2021-11-02ATHC-PRP
M5051987/64285178666161124178847 : 5B6450C42D203CFA
PRP proof power = 7
PRP: Verified
Proof certified good
2021-11-01ATHF-PP1
Start=2/7, B1=2500000, B2=92500000, Factor: 64285178666161124178847
2021-04-02-Anonymous-NF
no factor from 2^71 to 2^72
2021-03-27-Anonymous-NF
no factor from 2^70 to 2^71
2021-03-27-Anonymous-NF
no factor from 2^69 to 2^70
2021-02-15TJAOINF
no factor from 2^68 to 2^69
2018-06-11ramgeisNF
no factor from 2^67 to 2^68
2017-03-08Squeeky_SquirrelNF-PM1
B1=300000, B2=9450000, E=12
2016-05-20Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^61 to 2^63
2015-08-01snme2pm1NF
no factor from 2^65 to 2^66
2014-09-14monstNF
no factor from 2^64 to 2^65
2014-09-03krackerNF
no factor from 2^63 to 2^64
2009-07-28USAFSSNF-PM1
B1=55000, B2=907500, E=6