12 479 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Details

Composite, with 4 known prime factors. Cofactor is composite.

Trial Factored to 2⁶⁸

TF target 2⁴⁴

Factored

Factor	Digits	Bits	Date
99833	5	16.6	old
9508999	7	23.2	2008-08-26 19:58:37
125289161	9	26.9	2008-08-26 19:58:37
4487476052365849	16	52.0	2008-08-26 19:58:37

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	1446 / 9201

Estimated T-Level: 40.8 ⓘ

TF below 2^130 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	573AA4DD04B3F522	4	0	1	3
Verified	No proof (small exponent)	2017-10-02	kkmrkkblmbrbk	573AA4DD04B3F522	4	0	1	3
Verified	No proof (small exponent)	2017-12-07	ATH	573AA4DD04B3F522	4	10276	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	D0126315997711DB	4	10820	5	3
Verified	No proof (small exponent)	2024-07-01	kkmrkkblmbrbk	D0126315997711DB	4	12038	5	3

History

Date	User	Type	Result
2025-03-04	masser	NF-PP1	Start=77/23, B1=430000000, B2=429570000000
2025-02-23	masser	NF-PP1	Start=6/5, B1=430000000, B2=429570000000
2025-01-18	masser	NF-PP1	Start=2/7, B1=430000000, B2=429570000000
2024-07-01	kkmrkkblmbrbk	C-PRP	M12479/125289161/4487476052365849/9508999/99833 : D0126315997711DB
2023-05-13	-anonymous-	NF-PM1	B1=100000000000, B2=120417199046794650
2020-04-17	Oliver Kruse	C-PRP	M12479/99833/9508999/125289161/4487476052365849 : D0126315997711DB
2017-12-07	ATH	C-PRP	M12479/99833/9508999/125289161/4487476052365849 : 573AA4DD04B3F522
2017-10-02	kkmrkkblmbrbk	C-PRP	M12479/99833/9508999/125289161/4487476052365849 : 573AA4DD04B3F522
2017-09-21	Oliver Kruse	C-PRP	M12479/known_factors : 573AA4DD04B3F522
2016-09-09	kkmrkkblmbrbk	NF-PM1	B1=100000000, B2=10000000000, E=12
2008-08-26	-anonymous-	F-PM1	Factor: 4487476052365849
2008-08-26	-anonymous-	F	Factor: 125289161
2008-08-26	-anonymous-	F	Factor: 9508999