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

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MnStatusDetails
1896761Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
42113747160775219991961.92011-03-08 05:18:36
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
BadAlex and Nick Myrman73A20
Verified (Factored)Barry Reesor5048820E311F73A10
Verified (Factored)2002-05-25S574835048820E311F73A11074347
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02KrieselD6BB791EC2FD3B9F013
PRP Cofactor
StatusDateUserResidueNumber of
known factors		ShiftTypeBase
Verified2017-10-04Oliver Kruse9353895514E48A711013
Verified2017-11-09kkmrkkblmbrbk9353895514E48A711127994013
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
D6BB791EC2FD3B9F
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2022-08-30USAFSSNF-PM1
B1=480000, B2=514636584
2022-04-12Lisander ViaeneNF-PM1
B1=500100
2022-03-09LordJuliusNF
no factor from 2^1 to 2^60
2022-03-08LordJuliusNF
no factor from 2^58 to 2^60
2017-11-09kkmrkkblmbrbkC-PRP
M1896761/4211374716077521999 : 9353895514E48A71
PRP: Verified
PRP without proof (not generated)
2017-10-04Oliver KruseC-PRP
M1896761/4211374716077521999 : 9353895514E48A71
PRP: Verified
PRP without proof (not generated)
2011-03-08GrunwalderGIMPF-ECM
Factor: 4211374716077521999
2010-04-10Architects CubedNF
no factor from 2^60 to 2^61