12 917 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
2492406607497376989889734102282075241	37	120.9	old

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	1585 / 9201

Estimated T-Level: 40.9 ⓘ

TF below 2^131 is very unlikely to find new factors due to ECM effort.

PRP Cofactor

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	No proof (small exponent)	2017-09-21	Oliver Kruse	EA2BAE271B6BCD3F	1	0	1	3
Verified	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	EA2BAE271B6BCD3F	1	3704	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	40C0CCC85AF0E3C2	1	389	5	3
Verified	No proof (small exponent)	2024-07-01	kkmrkkblmbrbk	40C0CCC85AF0E3C2	1	2468	5	3

History

Date	User	Type	Result
2025-03-03	masser	NF-PP1	Start=93/53, B1=430000000, B2=429570000000
2025-02-16	masser	NF-PP1	Start=6/5, B1=430000000, B2=429570000000
2025-01-16	masser	NF-PP1	Start=2/7, B1=430000000, B2=429570000000
2024-07-01	kkmrkkblmbrbk	C-PRP	M12917/2492406607497376989889734102282075241 : 40C0CCC85AF0E3C2
2023-10-10	Anton Repko	NF-PM1	B1=100000000000, B2=122154521813133810
2023-05-15	JacobZ	NF-PM1	B1=8600000000, B2=36024966470342850
2020-04-17	Oliver Kruse	C-PRP	M12917/2492406607497376989889734102282075241 : 40C0CCC85AF0E3C2
2017-10-12	kkmrkkblmbrbk	C-PRP	M12917/2492406607497376989889734102282075241 : EA2BAE271B6BCD3F
2017-09-21	Oliver Kruse	C-PRP	M12917/2492406607497376989889734102282075241 : EA2BAE271B6BCD3F
2017-09-21	Oliver Kruse	C-PRP	M12917/2492406607497376989889734102282075241 : EA2BAE271B6BCD3F
2003-09-29	-anonymous-	NF-PM1	B1=16777216, B2=1677721600, E=12
2003-09-29	-anonymous-	NF-PM1	B1=8388608, B2=838860800, E=12
2003-07-06	-anonymous-	NF-PM1	B1=4194304, B2=419430400, E=12
2003-05-19	-anonymous-	NF-PM1	B1=2097152, B2=209715200, E=12
2003-04-27	-anonymous-	NF-PM1	B1=1048576, B2=104857600, E=48
2003-04-03	-anonymous-	NF-PM1	B1=524288, B2=52428800, E=48
2003-03-27	-anonymous-	NF-PM1	B1=262144, B2=26214400, E=30
2003-02-02	-anonymous-	NF-PM1	B1=131072, B2=13107200, E=30
2002-08-17	-anonymous-	NF	no factor TF: 1-57
2002-07-14	-anonymous-	NF-PM1	B1=65536, B2=6553600, E=12
2002-06-09	-anonymous-	NF-PM1	B1=32768, B2=3276800
2002-04-28	-anonymous-	NF-PM1	B1=16384, B2=1638400
2001-09-30	-anonymous-	NF-PM1	B1=43000000, B2=4290000000
2001-07-17	Alex Kruppa	NF-PM1	B1=1000000, B2=100000000
2001-04-29	-anonymous-	NF-PM1	B1=100000, B2=10000000
2000-07-25	-anonymous-	NF	no factor TF: 1-56
2000-01-25	-anonymous-	NF	no factor TF: 53-54
1999-09-14	-anonymous-	NF	no factor TF: 52-53

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