Marin Mersenne 2^P-1
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Finding World Record Primes Since 1996

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MnStatusDetails
354121Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
77650988417591838867017440373716733109.32019-03-13 23:39:30
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000161 / 1566
Estimated T-Level: 30.5 ⓘ
TF below 2^96 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)David Slowinski23CC0
Verified (Factored)Unknown23CC0
Verified (Factored)Ken Kriesel9168B497AB4E23CC0
Verified (Factored)Brian J. Beesley9168B497AB4E23CC0
Verified (Factored)Eivind Triel9168B497AB4E23CC268984
Verified (Factored)2016-06-01MadPoo9168B497AB4E23CC20830
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2019-03-14alex0749559F2439076D1577253
Verified2019-03-15_p95holder_0749559F2439076D129057453
History
DateUserTypeResult
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2019-03-15_p95holder_C-PRP
M354121/776509884175918388670174403737167 : 0749559F2439076D
PRP: Verified
PRP without proof (small exponent)
2019-03-14alexC-PRP
M354121/776509884175918388670174403737167 : 0749559F2439076D
PRP: Verified
PRP without proof (small exponent)
2019-03-13alexF-ECM
Factor: 776509884175918388670174403737167 / (ECM curve 395, B1=250000, B2=25000000, Sigma=5426170763909216)
2018-02-17Gordon SpenceNF
no factor from 2^64 to 2^65
2016-11-08mikrNF-PM1
B1=60000000, B2=3000000000, E=12
2016-06-01MadPooC-LL
9168B497AB4E23CC
2015-12-19Gordon SpenceNF
no factor from 2^63 to 2^64
2015-12-19Gordon SpenceNF
no factor from 2^62 to 2^63
2015-07-26NRNF
no factor from 2^61 to 2^62
2013-05-21lycornNF
no factor from 2^60 to 2^61
2012-03-01alpertronNF-PM1
B1=10000000, B2=200000000, E=12
2011-08-09JossNF-PM1
B1=1276438
2009-01-25Sturle SundeNF
no factor from 2^59 to 2^60
2008-12-29Sturle SundeNF
no factor from 2^58 to 2^59