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

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MnStatusDetails
1611433Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
122173016676407793715272373.42017-04-25 20:16:43
ECM
DigitsB1Curves
2550000280 / 280
30250000107 / 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)Keith Allen0CB937B89F008DFF0
Verified (Factored)1998-11-21Ken Warner0CB937B89F008DFF583821
Verified (Factored)2015-07-20MadPoo0CB937B89F008DFF389420
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02KrieselE5BEDFD4E0015E0C013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-02Oliver KruseF8BF68C496E100361013
Verified2017-11-01kkmrkkblmbrbkF8BF68C496E10036196012313
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
E5BEDFD4E0015E0C
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2017-11-01kkmrkkblmbrbkC-PRP
M1611433/12217301667640779371527 : F8BF68C496E10036
PRP: Verified
PRP without proof (not generated)
2017-10-02Oliver KruseC-PRP
M1611433/12217301667640779371527 : F8BF68C496E10036
PRP: Verified
PRP without proof (not generated)
2017-04-25ANONYMOUSF-ECM
Factor: 12217301667640779371527 / (ECM curve 3, B1=50000, B2=5000000)
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2015-10-11ramgeisNF
no factor from 2^65 to 2^66
2015-07-20MadPooC-LL
0CB937B89F008DFF
2015-04-27monstNF
no factor from 2^64 to 2^65
2015-04-26omylistNF
no factor from 2^63 to 2^64
2011-11-16BigBrotherNF-PM1
B1=1000000, B2=20000000, E=12
2010-07-12GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-05-02Architects CubedNF
no factor from 2^60 to 2^61