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

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MnStatusDetails
1726667Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
15755398488382894063285921108582733158411142136.92023-06-22 22:05:05
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)John Lloyd4B42ED5C5720235D0
Verified (Factored)1999-01-02Steven Troulis4B42ED5C5720235D1667959
Verified (Factored)2015-06-29MadPoo4B42ED5C5720235D71337
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2023-06-22linament3F94D5F1A535C5771130451753
P-1 factors
DateFactorB1B2
2023-06-2215755398488382894063285921108582733158411117000000272007836100
History
DateUserTypeResult
2023-06-22LOBESCERT
PRP Certification
Proof certified good
2023-06-22linamentC-PRP
M1726667/157553984883828940632859211085827331584111 : 3F94D5F1A535C577
PRP proof power = 7
PRP: Verified
Proof certified good
2023-06-22linamentF-PM1
Factor: 157553984883828940632859211085827331584111 / (P-1, B1=17000000, B2=272007836100)
2023-03-20JossNF-PM1
B1=1726667, B2=3382777860
2023-01-04JossNF-PM1
B1=1726667, B2=1254200640
2022-07-30masserNF-PP1
Start=160/43, B1=1700000, B2=61200000
2019-06-24TJAOINF
no factor from 2^67 to 2^68
2018-10-17JossNF-PM1
B1=1726667, B2=189933370, E=12
2018-10-12JossNF-PM1
B1=1726667, B2=172666700, E=12
2018-10-07JossNF-PM1
B1=1726667, B2=69066680, E=12
2018-10-03JossNF-PM1
B1=1726667, B2=17266670, E=12
2018-04-02TJAOINF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-09-05mikrNF-PM1
B1=3642200, B2=123456789, E=12
2015-09-02ramgeisNF
no factor from 2^65 to 2^66
2015-07-24JossNF-PM1
B1=1560969
2015-07-21JossNF-PM1
B1=1419063
2015-07-07JossNF-PM1
B1=1290058
2015-06-29MadPooC-LL
4B42ED5C5720235D
2015-06-25JossNF-PM1
B1=1172780
2015-06-08JossNF-PM1
B1=1066164
2015-05-26JossNF-PM1
B1=969240
2015-05-22JossNF-PM1
B1=881128
2015-05-07JossNF-PM1
B1=801026
2015-05-04snme2pm1NF
no factor from 2^64 to 2^65
2015-05-04snme2pm1NF
no factor from 2^63 to 2^64
2015-05-01JossNF-PM1
B1=728206
2015-04-08JossNF-PM1
B1=601824
2015-03-15JossNF-PM1
B1=497376
2015-03-08JossNF-PM1
B1=452160
2015-02-21JossNF-PM1
B1=411055
2015-02-11JossNF-PM1
B1=373687
2015-01-09JossNF-PM1
B1=280758
2014-10-03JossNF-PM1
B1=187172
2014-05-04JossNF-PM1
B1=150000
2014-04-04JossNF-PM1
B1=100000
2011-02-11Carsten KossendeyNF-PM1
B1=90000, B2=1530000, E=6
2010-10-27GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-04-23Architects CubedNF
no factor from 2^60 to 2^61