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

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MnStatusDetails
1687999Composite, with 1 known prime factor. Cofactor is composite.
Factored
FactorDigitsBitsDate
6976924846236096712028643330495132105.82023-01-04 18:13:15
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)Dave Wilson84002EC536309D380
Verified (Factored)1998-11-28Jan H. Hansen84002EC536309D38133426
Verified (Factored)2015-07-01MadPoo84002EC536309D381660395
PRP Cofactor
StatusDateUserResidueNumber of
known factors
ShiftTypeBase
Verified2023-01-04Naegi Makoto3478524AEE758F67195131353
P-1 factors
DateFactorB1B2
2023-01-0469769248462360967120286433304951500000001214166083130
History
DateUserTypeResult
2023-01-04Albert PetterssonCERT
PRP Certification
Proof certified good
2023-01-04Naegi MakotoC-PRP
M1687999/69769248462360967120286433304951 : 3478524AEE758F67
PRP proof power = 6
PRP: Verified
Proof certified good
2023-01-04Naegi MakotoF-PM1
Factor: 69769248462360967120286433304951 / (P-1, B1=50000000, B2=1214166083130)
2023-01-03JossNF-PM1
B1=1687999, B2=1249943310
2019-06-24TJAOINF
no factor from 2^67 to 2^68
2018-10-16JossNF-PM1
B1=1687999, B2=185679890, E=12
2018-06-15JossNF-PM1
B1=1687999, B2=168799900, E=12
2018-02-19JossNF-PM1
B1=1687999, B2=80000000, E=12
2018-02-06JossNF-PM1
B1=1687999, B2=40000000, E=12
2018-01-21JossNF-PM1
B1=1687999, B2=20000000, E=12
2017-09-15TJAOINF
no factor from 2^66 to 2^67
2016-02-23Mark RoseNF
no factor from 2^62 to 2^63
2016-02-23Mark RoseNF
no factor from 2^58 to 2^60
2016-02-23Mark RoseNF
no factor from 2^61 to 2^62
2015-10-11ramgeisNF
no factor from 2^65 to 2^66
2015-07-01MadPooC-LL
84002EC536309D38
2015-05-15monstNF
no factor from 2^64 to 2^65
2015-05-15omylistNF
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
2011-01-25JossNF-PM1
B1=50000
2010-09-13GrunwalderGIMPNF
no factor from 2^1 to 2^63
2010-04-26Architects CubedNF
no factor from 2^60 to 2^61