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
3620207Factored
FactorDigitsBitsDate
712717877047199608056456637680304100937122.42020-06-19 01:29:29
ECM
DigitsB1Curves
255000012 / 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)Irv RabinowitzF8D74A0A96AACA370
Verified (Factored)1998-04-27Gerard PostumaF8D74A0A96AACA370
Verified (Factored)1999-10-07Alexey GuzeevF8D74A0A96AACA37564111
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2020-06-19Christoph ZengerB358EB31EE183DEB1165167353
Verified2020-06-20Team_InspectorB358EB31EE183DEB1308993253
P-1 factors
DateFactorB1B2
2020-06-19712717877047199608056456637680304100930000000600000000
History
DateUserTypeResult
2022-07-17JossNF-PM1
B1=3620207, B2=3640659750
2022-05-24JossNF-PM1
B1=100000, B2=130364850
2020-06-20Team_InspectorC-PRP
M3620207/7127178770471996080564566376803041009 : B358EB31EE183DEB
PRP: Verified
PRP without proof (not generated)
2020-06-19Christoph ZengerC-PRP
M3620207/7127178770471996080564566376803041009 : B358EB31EE183DEB
PRP: Verified
PRP without proof (not generated)
2020-06-19axnF-PM1
Factor: 7127178770471996080564566376803041009 / (P-1, B1=30000000, B2=600000000, E=12)
2018-11-12TJAOINF
no factor from 2^67 to 2^68
2016-12-23Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-10-18ramgeisNF
no factor from 2^65 to 2^66
2015-01-20VictordeHollanderNF
no factor from 2^64 to 2^65
2015-01-20VictordeHollanderNF
no factor from 2^63 to 2^64
2012-06-05GrunwalderGIMPNF
no factor from 2^1 to 2^63
2011-12-20markrNF-PM1
B1=240000, B2=6180000, E=12
2011-06-03markrNF
no factor to 2^62
2009-07-06Carsten KossendeyNF-PM1
B1=20000, B2=245000
2009-03-12S485122NF
no factor from 2^60 to 2^61