1 486 691 Exponent Status

PrimeNet Exponent Status

M_n

Details

Composite, with 1 known prime factor. Cofactor is composite.

Trial Factored to 2⁶⁸

TF target 2⁶¹

Factored

Factor	Digits	Bits	Date
201696953209713771859636567	27	87.4	2018-10-15 23:03:02

P-1 factors

Date	Factors	B1	B2
2018-10-15	201696953209713771859636567	1486691	163536010

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	105 / 640

Estimated T-Level: 25.8 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Software
Factored		Mischa Kenn	9BC9A07CAC17EDFA	0	Windows,Prime95,v14,(aka WQ1)
Factored	1999-01-17	Gary Samad	9BC9A07CAC17EDFA	510179	Linux 32-bit,Prime95,v17,(aka WT2)
Factored	2015-07-19	MadPoo 🙂	9BC9A07CAC17EDFA	454040	Windows 64-bit,Prime95,v26,(aka We4)

PRP

Status	Proof	Date	User	Residue	Shift	Type	Base
Factored	Certified Good Power=6	2025-09-01	Kriesel	B2676493AA46F907	0	1	3

PRP Cofactor

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2018-10-15	rucio	B2676493AA46F907	1	115750	5	3
Verified	PRP without proof (not generated)	2018-10-15	storm5510	B2676493AA46F907	1	1015544	5	3

History

Date	User	Type	Result
2025-09-03	Carlos Pinho	CERT	Proof certified good
2025-09-01	Kriesel	C-PRP	B2676493AA46F907 Proof Certified Good Proof Power: 6
2023-12-23	Anton Tsvetkov	NF-PM1	B1=5000000, B2=1003748460
2018-10-15	storm5510	C-PRP	M1486691/201696953209713771859636567 : B2676493AA46F907
2018-10-15	rucio	C-PRP	M1486691/201696953209713771859636567 : B2676493AA46F907
2018-10-15	Joss	F-PM1	Factor: 201696953209713771859636567 / B1=1486691, B2=163536010
2018-03-19	Joss	NF-PM1	B1=1486691, B2=148669100, E=12
2018-03-17	Joss	NF-PM1	B1=1486691, B2=60000000, E=12
2018-02-19	TJAOI	NF	no factor TF: 66-67
2016-02-23	Mark Rose	NF	no factor TF: 62-63
2016-02-23	Mark Rose	NF	no factor TF: 58-60
2016-02-23	Mark Rose	NF	no factor TF: 61-62
2015-09-23	ramgeis	NF	no factor TF: 65-66
2015-07-19	MadPoo 🙂	C-LL	9BC9A07CAC17EDFA
2015-04-06	snme2pm1	NF	no factor TF: 64-65
2015-04-06	snme2pm1	NF	no factor TF: 63-64
2015-03-22	alpertron	NF-PM1	B1=2000000, B2=60000000, E=12
2011-05-07	GrunwalderGIMP	NF	no factor TF: 1-63
2011-01-29	Rob_Dee	NF-PM1	B1=200000, B2=5000000, E=6
2011-01-28	Rob_Dee	NF-PM1	B1=200000, B2=4000000, E=6
2011-01-27	Rob_Dee	NF-PM1	B1=200000, B2=3000000, E=6
2011-01-26	Rob_Dee	NF-PM1	B1=200000, B2=2000000, E=6
2011-01-25	Rob_Dee	NF-PM1	B1=200000, B2=1000000, E=6
2011-01-24	Rob_Dee	NF-PM1	B1=200000, B2=300000
2011-01-23	Rob_Dee	NF-PM1	B1=100000, B2=200000
2010-05-05	Architects Cubed	NF	no factor TF: 60-61
2003-09-29	Team Prime Rib	NF-PM1	B1=20000, B2=270000
2003-07-30	-anonymous-	NF	no factor TF: 1-58
1999-03-01	-anonymous-	C-LL	9BC9A07CAC17EDFA
1999-03-01	-anonymous-	NF	no factor TF: 1-57
1999-01-17	-anonymous-	NF	no factor TF: 1-57
1999-01-17	-anonymous-	C-LL	9BC9A07CAC17EDFA

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