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

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MnStatusDetails
1994467Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
620594117996684539112712375.72011-03-02 10:39:18
ECM
DigitsB1Curves
2550000280 / 280
30250000106 / 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)ROLAND BOCKHORST8D1FD8CA5A44FA160
Verified (Factored)1999-01-02Robert Mutschler8D1FD8CA5A44FA161924767
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02KrieselA9636C2142551C35013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2017-10-05Oliver Kruse77892B03032557A21013
Verified2017-11-13kkmrkkblmbrbk77892B03032557A21178104913
History
DateUserTypeResult
2025-09-03AndreCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
A9636C2142551C35
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2022-08-15USAFSSNF-PM1
B1=132000, B2=134381520
2022-03-09LordJuliusNF
no factor from 2^1 to 2^60
2017-11-13kkmrkkblmbrbkC-PRP
M1994467/62059411799668453911271 : 77892B03032557A2
PRP: Verified
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1994467/62059411799668453911271 : 77892B03032557A2
PRP: Verified
PRP without proof (not generated)
2011-03-02kurlyF-PM1
Factor: 62059411799668453911271
2009-12-08S485122NF
no factor from 2^60 to 2^61