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
2338607Factored
FactorDigitsBitsDate
16861456447770012485336252632890.42021-05-14 20:51:44
ECM
DigitsB1Curves
2550000143 / 280
Estimated T-Level: 22.6 ⓘ
TF below 2^70 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David van Balgooi987473A1EAB3308C0
Verified (Factored)1999-04-02Trevor Fast987473A1EAB3308C1432084
Verified (Factored)2018-05-07kkmrkkblmbrbk987473A1EAB3308C1125108
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2021-05-16kutens69D3861BCD6C7962199854453
History
DateUserTypeResult
2021-05-16SirbudrickCERT
PRP Certification
Proof certified good
2021-05-16kutensC-PRP
M2338607/1686145644777001248533625263 : 69D3861BCD6C7962
PRP proof power = 7
PRP: Verified
Proof certified good
2021-05-14kutensF-ECM
Factor: 1686145644777001248533625263 / (ECM curve 3, B1=50000, B2=5100000, Sigma=259019075764266)
2019-03-18TJAOINF
no factor from 2^67 to 2^68
2018-05-07kkmrkkblmbrbkC-LL
987473A1EAB3308C
2018-03-07Sid & AndyNF-PM1
B1=6000000, B2=180000000, E=12
2017-06-07Gordon SpenceNF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^1 to 2^60
2015-10-25ramgeisNF
no factor from 2^65 to 2^66
2015-03-03VictordeHollanderNF
no factor from 2^64 to 2^65
2015-03-03VictordeHollanderNF
no factor from 2^63 to 2^64
2013-12-04Luigi MorelliNF
no factor from 2^62 to 2^63
2012-05-28Sebastian HornbostelNF
no factor from 2^61 to 2^62
2010-03-01BudNF-PM1
B1=500000, B2=10000000, E=12
2009-01-11Sturle SundeNF
no factor from 2^60 to 2^61