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
1372207Factored
FactorDigitsBitsDate
6397780724431738739755692479.12014-02-18 20:25:49
ECM
DigitsB1Curves
2550000280 / 280
30250000105 / 640
Estimated T-Level: 25.8 ⓘ
TF below 2^81 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Jim MulveyB301EFE27B6E6CF10
Verified (Factored)Cornelius CaesarB301EFE27B6E6CF10
Verified (Factored)Brian J. BeesleyB301EFE27B6E6CF1807157
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-09-30Oliver Kruse8D1A17CF5871EB651013
Verified2017-10-25kkmrkkblmbrbk8D1A17CF5871EB651133854513
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^58 to 2^60
2017-10-25kkmrkkblmbrbkC-PRP
M1372207/639778072443173873975569 : 8D1A17CF5871EB65
PRP: Verified
PRP without proof (not generated)
2017-09-30Oliver KruseC-PRP
M1372207/639778072443173873975569 : 8D1A17CF5871EB65
PRP: Verified
PRP without proof (not generated)
2014-02-18jim f in mnF-ECM
Factor: 639778072443173873975569
2013-01-23dbaughNF
no factor from 2^62 to 2^63
2012-08-10Sebastian HornbostelNF
no factor from 2^61 to 2^62
2009-02-15Sturle SundeNF
no factor from 2^60 to 2^61