Marin Mersenne 2^P-1
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MnStatusDetails
1980247Composite, with 2 known prime factors. Cofactor is composite.
Factored
FactorDigitsBitsDate
10280074257349135932312269.82011-01-26 08:14:22
323046239750060347430626872684.72022-08-02 10:17:05
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)Thomas HonoldC454AEF32D53B18A0
Verified (Factored)1999-01-17Hans OpsahlC454AEF32D53B18A1681879
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02KrieselA9D295A013430694013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified (Factored)2017-10-05Oliver Kruse5E7C5969184A3DE81013
Verified (Factored)2017-11-12kkmrkkblmbrbk5E7C5969184A3DE8148577713
Verified2022-08-03LordJuliusA9D295A013430694258536753
History
DateUserTypeResult
2025-09-03KrieselCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
A9D295A013430694
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2022-10-30USAFSSNF-PM1
B1=650000, B2=730452492
2022-08-13USAFSSNF-PM1
B1=88000, B2=95986800
2022-08-03MarekCERT
PRP Certification
Proof certified good
2022-08-03LordJuliusC-PRP
M1980247/1028007425734913593231/32304623975006034743062687 : A9D295A013430694
PRP proof power = 7
PRP: Verified
Proof certified good
2022-08-02TJAOIF-ECM
Factor: 32304623975006034743062687 / (ECM curve 60, B1=50000, B2=7500000)
2022-03-09LordJuliusNF
no factor from 2^1 to 2^60
2017-11-12kkmrkkblmbrbkC-PRP
M1980247/1028007425734913593231 : 5E7C5969184A3DE8
PRP: Verified (Factored)
PRP without proof (not generated)
2017-10-05Oliver KruseC-PRP
M1980247/1028007425734913593231 : 5E7C5969184A3DE8
PRP: Verified (Factored)
PRP without proof (not generated)
2011-01-26kurlyF-PM1
Factor: 1028007425734913593231
2009-12-20S485122NF
no factor from 2^60 to 2^61