8 647 Exponent Status

PrimeNet Exponent Status

M_n

Details

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

Trial Factored to 2⁶⁸

TF target 2⁴⁴

Factored

Factor	Digits	Bits	Date
5528411860854571021160593798328404159	37	122.1	old

ECM

Estimated T-Level: 47.5 ⓘ

TF below 2^153 is very unlikely to find new factors due to ECM effort.

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	No proof (small exponent)	2017-09-21	Oliver Kruse	DD1A2187A2ABD1E2	1	0	1	3
Verified	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	DD1A2187A2ABD1E2	1	4242	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	DEBE7CCE40122C7B	1	4908	5	3
Verified	No proof (small exponent)	2023-05-07	retsu	DEBE7CCE40122C7B	1	8462	5	3

History

Date	User	Type	Result
2025-05-05	masser	NF-PP1	Start=84/13, B1=1000000000, B2=999000000000
2023-08-12	JacobZ	NF-PM1	B1=68000000000, B2=265422648792401100
2023-05-07	retsu	C-PRP	M8647/5528411860854571021160593798328404159 : DEBE7CCE40122C7B
2021-12-15	ANONYMOUS	NF-PM1	B1=101101101, B2=26122831594860
2020-04-17	Oliver Kruse	C-PRP	M8647/5528411860854571021160593798328404159 : DEBE7CCE40122C7B
2017-10-12	kkmrkkblmbrbk	C-PRP	M8647/5528411860854571021160593798328404159 : DD1A2187A2ABD1E2
2017-09-21	Oliver Kruse	C-PRP	M8647/5528411860854571021160593798328404159 : DD1A2187A2ABD1E2
2017-09-21	Oliver Kruse	C-PRP	M8647/5528411860854571021160593798328404159 : DD1A2187A2ABD1E2
2003-02-24	-anonymous-	NF-PM1	B1=4290000000
2002-12-16	-anonymous-	NF	no factor TF: 1-57
2002-10-26	-anonymous-	NF-PM1	B1=3221225472, B2=4290000000, E=48
2002-08-31	-anonymous-	NF-PM1	B1=2147483648, B2=4290000000, E=48
2002-06-15	-anonymous-	NF-PM1	B1=1073741824, B2=4290000000, E=48
2001-09-10	-anonymous-	NF-PM1	B1=3000000000, B2=4290000000
2001-06-23	-anonymous-	NF-PM1	B1=43000000, B2=4290000000
2001-02-11	-anonymous-	NF-PM1	B1=1000000, B2=100000000
2000-07-25	-anonymous-	NF	no factor TF: 1-56
2000-02-23	-anonymous-	NF	no factor TF: 54-55
1999-12-30	-anonymous-	NF	no factor TF: 53-54
1999-09-22	-anonymous-	NF	no factor TF: 52-53

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