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
11950403Factored
FactorDigitsBitsDate
612738709540436163239678172685.72021-07-28 07:35:37
ECM
DigitsB1Curves
255000087 / 280
Estimated T-Level: 21.6 ⓘ
TF below 2^67 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)2001-06-23Aaron BFD0B8294F14C3FCB4233349
Verified (Factored)2004-06-21S191941FD0B8294F14C3FCB5960537
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2021-12-10kutensFCA97B5D538DD7D91152779753
History
DateUserTypeResult
2021-12-10Ben DeloCERT
PRP Certification
Proof certified good
2021-12-10kutensC-PRP
M11950403/61273870954043616323967817 : FCA97B5D538DD7D9
PRP proof power = 8
PRP: Verified
Proof certified good
2021-07-28LaurVF-PP1
Start=2/7, B1=5000000, B2=300000000, Factor: 61273870954043616323967817
2021-07-14LaurVNF-PM1
B1=4316189, B2=127521607
2021-05-19lycornNF
no factor from 2^69 to 2^70
2019-05-08riccardo ubertiNF-PM1
B1=430000, B2=8500000, E=12
2018-01-07ramgeisNF
no factor from 2^68 to 2^69
2018-01-07ramgeisNF
no factor from 2^67 to 2^68
2016-03-03YxinityNF
no factor from 2^66 to 2^67
2013-10-20NesowaNF
no factor from 2^65 to 2^66
2013-10-06lycornNF
no factor from 2^64 to 2^65