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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MnStatusDetails
5209129Factored
FactorDigitsBitsDate
638168703190790258251265709653179075337122.32021-09-09 01:45:07
ECM
DigitsB1Curves
25500009 / 280
Estimated T-Level: 20.2
TF below 2^62 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Ken Kriesel455489CED1BCAB300
Bad2000-05-24Alexander Schulz694CCA8C081370714037865
Verified (Factored)2001-06-17Stephen Wood455489CED1BCAB302790680
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2021-09-15LaurVA1EEA3B89A4485EB1282253253
P-1 factors
DateFactorB1B2
2021-09-0963816870319079025825126570965317907538000000400000000
History
DateUserTypeResult
2021-09-15Architects CubedCERT
PRP Certification
Proof certified good
2021-09-15LaurVC-PRP
M5209129/6381687031907902582512657096531790753 : A1EEA3B89A4485EB
PRP proof power = 7
PRP: Verified
Proof certified good
2021-09-09axnF-PM1
Factor: 6381687031907902582512657096531790753 / (P-1, B1=8000000, B2=400000000)
2021-08-23SRBaseNF
no factor from 2^70 to 2^71
2021-08-18SRBaseNF
no factor from 2^69 to 2^70
2020-12-08TJAOINF
no factor from 2^68 to 2^69
2018-06-17ramgeisNF
no factor from 2^67 to 2^68
2018-04-11Squeeky_SquirrelNF-PM1
B1=310000, B2=9222500, E=12
2016-05-28Gordon SpenceNF
no factor from 2^66 to 2^67
2015-08-10snme2pm1NF
no factor from 2^65 to 2^66
2014-12-19VictordeHollanderNF
no factor from 2^64 to 2^65
2014-12-19VictordeHollanderNF
no factor from 2^63 to 2^64
2009-10-12USAFSSNF-PM1
B1=60000, B2=975000, E=6
2009-06-18GrunwalderGIMPNF
no factor from 2^62 to 2^63