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

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MnStatusDetails
1926487Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
6904852173563791593624524300858332105.82023-10-09 22:49:53
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)tom ehlert8DF0680E3F41F0E00
Verified (Factored)1999-01-17Boris Zupanic8DF0680E3F41F0E01247668
Verified (Factored)2015-07-14MadPoo8DF0680E3F41F0E0119088
PRP
StatusDateUserResidueShiftTypeBase
Verified (Factored)2025-09-02Kriesel585625FE3F8C986E013
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2023-10-11Naegi Makoto585625FE3F8C986E1147869753
P-1 factors
DateFactorB1B2
2023-10-09690485217356379159362452430085831810000058028260290
History
DateUserTypeResult
2025-09-03Carlos PinhoCERT
PRP Certification
CERT proof power = 6
Proof certified good
2025-09-02KrieselC-PRP
585625FE3F8C986E
PRP proof power = 6
PRP: Verified (Factored)
Proof certified good
2023-10-11Peter EvansCERT
PRP Certification
Proof certified good
2023-10-11Naegi MakotoC-PRP
M1926487/69048521735637915936245243008583 : 585625FE3F8C986E
PRP proof power = 7
PRP: Verified
Proof certified good
2023-10-09Sid & AndyF-PM1
Factor: 69048521735637915936245243008583 / (P-1, B1=18100000, B2=58028260290)
2023-06-16JossNF-PM1
B1=1926487, B2=8448741210
2023-01-10JossNF-PM1
B1=1926487, B2=1653391740
2022-08-13masserNF-PP1
Start=2/7, B1=1500000, B2=54000000
2019-05-04chuenkitNF
no factor from 2^67 to 2^68
2018-10-08JossNF-PM1
B1=1926487, B2=192648700, E=12
2018-10-02JossNF-PM1
B1=1926487, B2=154118960, E=12
2018-10-01JossNF-PM1
B1=1926487, B2=134854090, E=12
2018-04-02TJAOINF
no factor from 2^66 to 2^67
2016-09-07mikrNF-PM1
B1=4400000, B2=130000000, E=12
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2015-10-08Bruno VictalNF-PM1
B1=500000, B2=15000000, E=12
2015-09-03ramgeisNF
no factor from 2^65 to 2^66
2015-07-14MadPooC-LL
8DF0680E3F41F0E0
2015-05-17snme2pm1NF
no factor from 2^64 to 2^65
2015-05-17snme2pm1NF
no factor from 2^63 to 2^64
2011-08-27GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-02-10S485122NF
no factor from 2^60 to 2^61