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

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MnStatusDetails
1667873Factored
FactorDigitsBitsDate
6166933518320155539594671573637558050338125.52023-01-08 11:46:40
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)George Woltman967CCF4893FE1C440
Verified (Factored)1999-02-21Robert Mutschler967CCF4893FE1C44197528
Verified (Factored)2015-07-06MadPoo967CCF4893FE1C441492348
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2023-01-08Naegi MakotoB854540FDA5DE8191232153
P-1 factors
DateFactorB1B2
2023-01-086166933518320155539594671573637558050325000000556762626420
History
DateUserTypeResult
2023-01-08curtiscCERT
PRP Certification
Proof certified good
2023-01-08Naegi MakotoC-PRP
M1667873/61669335183201555395946715736375580503 : B854540FDA5DE819
PRP proof power = 6
PRP: Verified
Proof certified good
2023-01-08Naegi MakotoF-PM1
Factor: 61669335183201555395946715736375580503 / (P-1, B1=25000000, B2=556762626420)
2023-01-03JossNF-PM1
B1=1668873, B2=1152946410
2019-07-31TJAOINF
no factor from 2^67 to 2^68
2018-05-22VictordeHollanderNF-PM1
B1=10000000, B2=200000000, E=12
2018-02-21JossNF-PM1
B1=1667873, B2=80000000, E=12
2018-02-04JossNF-PM1
B1=1667873, B2=40000000, E=12
2018-01-22JossNF-PM1
B1=1667873, B2=20000000, E=12
2017-09-29TJAOINF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^57 to 2^60
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2015-10-11ramgeisNF
no factor from 2^65 to 2^66
2015-07-06MadPooC-LL
967CCF4893FE1C44
2015-05-12monstNF
no factor from 2^64 to 2^65
2015-05-11omylistNF
no factor from 2^63 to 2^64
2012-03-01AxonNF-PM1
B1=1000000, B2=20000000, E=12
2012-03-01AxonNF-PM1
B1=1000000, B2=8000000, E=12
2012-02-29AxonNF-PM1
B1=1000000
2012-02-29AxonNF-PM1
B1=900000
2012-02-29AxonNF-PM1
B1=800000
2012-02-29AxonNF-PM1
B1=700000
2012-02-29AxonNF-PM1
B1=600000
2012-02-29AxonNF-PM1
B1=500000
2012-02-29AxonNF-PM1
B1=400000
2012-02-29AxonNF-PM1
B1=300000
2012-02-29AxonNF-PM1
B1=200000
2012-02-29AxonNF-PM1
B1=100000
2010-08-22GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-04-29Architects CubedNF
no factor from 2^60 to 2^61