1 026 391 Exponent Status

PrimeNet Exponent Status

M_n

Details

Composite, with 2 known prime factors. Cofactor is composite.

Trial Factored to 2⁷¹

TF target 2⁶⁰

Factored

Factor	Digits	Bits	Date
1565518816363569144767	22	70.4	2015-03-05 13:11:31
77255756150014562665997791	26	86.0	2017-04-21 10:30:10

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	100 / 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		Peter Frostad	27DA60494FAB8EBA	0	Windows 16-bit,Prime95,v11,(aka WB)
Factored		David Slowinski	EBA	0	Cray,Slowinski,(aka D4)
Factored	2002-01-28	S57483	27DA60494FAB8EBA	722929	Linux 32-bit,Prime95,v21,(aka WX2)

PRP

Status	Proof	Date	User	Residue	Shift	Type	Base
Factored	Certified Good Power=6	2025-09-01	Kriesel	66E794B776B5C2DA	0	1	3

PRP Cofactor

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2017-10-05	Oliver Kruse	14B8C749F68313E8	2	0	1	3
Verified	PRP without proof (not generated)	2017-10-15	Oliver Kruse	14B8C749F68313E8	2	485426	1	3
Verified	PRP without proof (not generated)	2017-12-27	ATH	14B8C749F68313E8	2	909259	1	3

History

Date	User	Type	Result
2025-09-01	Joan Gayon	CERT	Proof certified good
2025-09-01	Kriesel	C-PRP	66E794B776B5C2DA Proof Certified Good Proof Power: 6
2022-03-07	LordJulius	NF	no factor TF: 58-60
2021-07-14	ViliamF	NF-PM1	B1=10000000, B2=1000000000
2017-12-27	ATH	C-PRP	M1026391/1565518816363569144767/77255756150014562665997791 : 14B8C749F68313E8
2017-10-15	Oliver Kruse	C-PRP	M1026391/1565518816363569144767/77255756150014562665997791 : 14B8C749F68313E8
2017-10-05	Oliver Kruse	C-PRP	M1026391/1565518816363569144767/77255756150014562665997791 : 14B8C749F68313E8
2017-09-28	Oliver Kruse	C-PRP	M1026391/1565518816363569144767/77255756150014562665997791 : 14B8C749F68313E8
2017-04-21	TJAOI	F-ECM	Factor: 77255756150014562665997791
2015-03-05	Jason U	F-ECM	Factor: 1565518816363569144767
2014-12-02	Joss	NF-PM1	B1=1026391
2014-10-17	Joss	NF-PM1	B1=325066
2014-07-18	Joss	NF-PM1	B1=262533
2014-04-01	Never Odd Or Even	NF	no factor TF: 70-71
2013-07-17	Never Odd Or Even	NF	no factor TF: 69-70
2013-07-17	Never Odd Or Even	NF	no factor TF: 68-69
2013-04-13	Never Odd Or Even	NF	no factor TF: 67-68
2013-04-13	Never Odd Or Even	NF	no factor TF: 66-67
2013-04-13	Never Odd Or Even	NF	no factor TF: 65-66
2013-04-13	Never Odd Or Even	NF	no factor TF: 64-65
2012-01-01	bcp19	NF-PM1	B1=200000, B2=10000000, E=12
2010-11-23	Michael C	NF	no factor TF: 63-64
2010-11-23	Michael C	NF	no factor TF: 62-63
2010-11-07	Michael C	NF	no factor TF: 61-62
2009-02-14	Sturle Sunde	NF	no factor TF: 60-61
2003-11-16	-anonymous-	NF-PM1	B1=2048, B2=204800
2003-02-02	-anonymous-	NF	no factor TF: 1-58
2002-11-16	Joss	NF-PM1	B1=20000
2002-10-07	Joss	NF-PM1	B1=15000
2002-01-28	-anonymous-	C-LL	27DA60494FAB8EBA
2002-01-22	Joss	NF-PM1	B1=10000, B2=127500
2001-11-03	-anonymous-	NF	no factor TF: 1-57

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