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

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MnStatusDetails
194203Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
37613975579281965060412271.72009-02-05 05:44:25
ECM
DigitsB1Curves
2550000280 / 280
30250000640 / 640
351000000221 / 1566
Estimated T-Level: 30.7
TF below 2^97 is very unlikely to find new factors due to ECM effort.
LL
StatusDateUserResidueShift
Verified (Factored)Amdahl 6 - 1989177DE24B0
Verified (Factored)Martin Eibl224D744DD77DE24B0
Verified (Factored)Brian J. Beesley224D744DD77DE24B0
Verified (Factored)Eivind Triel224D744DD77DE24B27334
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-09-22Oliver Kruse03EC4DF095F035341013
Verified2017-10-12kkmrkkblmbrbk03EC4DF095F03534114433713
Verified2020-04-17Oliver Kruse64BBCCAD5A0BDAC8112117853
Verified2023-08-24USAFSS64BBCCAD5A0BDAC8118618853
History
DateUserTypeResult
2023-08-24curtiscCERT
PRP Certification
Proof certified good
2023-08-24USAFSSC-PRP
M194203/3761397557928196506041 : 64BBCCAD5A0BDAC8
PRP proof power = 5
PRP: Verified
Proof certified good
2022-03-07LordJuliusNF
no factor from 2^57 to 2^58
2022-03-07LordJuliusNF
no factor from 2^54 to 2^55
2021-07-12ATHNF-PP1
Start=2/7, B1=15000000, B2=1500000000
2020-04-17Oliver KruseC-PRP
M194203/3761397557928196506041 : 64BBCCAD5A0BDAC8
PRP: Verified
PRP without proof (small exponent)
2017-10-12kkmrkkblmbrbkC-PRP
M194203/3761397557928196506041 : 03EC4DF095F03534
PRP: Verified
PRP without proof (small exponent)
2017-09-22Oliver KruseC-PRP
M194203/3761397557928196506041 : 03EC4DF095F03534
PRP: Verified
PRP without proof (not generated)
2017-09-22Oliver KruseC-PRP
M194203/3761397557928196506041 : 03EC4DF095F03534
PRP without proof (not generated)
2017-09-02kkmrkkblmbrbkNF-PM1
B1=100000000, B2=2000000000, E=12
2009-02-05Sturle SundeF-ECM
Factor: 3761397557928196506041
2009-02-03axnNF-PM1
B1=5000000, B2=200000000, E=12
2009-01-28Sturle SundeNF
no factor from 2^59 to 2^60
2008-12-31Sturle SundeNF
no factor from 2^58 to 2^59