12 979 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
1557481	7	20.6	old
148299014447	12	37.1	2008-08-26 19:58:39
247243849871	12	37.8	2008-08-26 19:58:39
14396779628733911	17	53.7	2008-08-29 02:24:32

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	1584 / 9201

Estimated T-Level: 40.9 ⓘ

TF below 2^131 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	D8DE9119199A4C82	4	0	1	3
Verified	No proof (small exponent)	2017-10-02	kkmrkkblmbrbk	D8DE9119199A4C82	4	0	1	3
Verified	No proof (small exponent)	2017-12-07	ATH	D8DE9119199A4C82	4	6624	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	F47F6C348F27C4D5	4	7267	5	3
Verified	No proof (small exponent)	2024-07-01	kkmrkkblmbrbk	F47F6C348F27C4D5	4	11484	5	3

History

Date	User	Type	Result
2025-03-06	masser	NF-PP1	Start=110/71, B1=430000000, B2=429570000000
2025-02-15	masser	NF-PP1	Start=6/5, B1=430000000, B2=429570000000
2025-01-31	masser	NF-PP1	Start=2/7, B1=430000000, B2=429570000000
2024-07-01	kkmrkkblmbrbk	C-PRP	M12979/14396779628733911/148299014447/1557481/247243849871 : F47F6C348F27C4D5
2023-10-10	-anonymous-	NF-PM1	B1=100000000000, B2=122154521813133810
2023-05-16	JacobZ	NF-PM1	B1=8500000000, B2=33523232658715800
2022-02-05	Joss	NF-PM1	B1=1000000, B2=3910366209750
2020-04-17	Oliver Kruse	C-PRP	M12979/1557481/148299014447/247243849871/14396779628733911 : F47F6C348F27C4D5
2017-12-07	ATH	C-PRP	M12979/1557481/148299014447/247243849871/14396779628733911 : D8DE9119199A4C82
2017-10-02	kkmrkkblmbrbk	C-PRP	M12979/1557481/148299014447/247243849871/14396779628733911 : D8DE9119199A4C82
2017-09-21	Oliver Kruse	C-PRP	M12979/1557481/148299014447/247243849871/14396779628733911 : D8DE9119199A4C82
2008-08-29	-anonymous-	F-PM1	Factor: 14396779628733911
2008-08-26	-anonymous-	F	Factor: 247243849871
2008-08-26	-anonymous-	F	Factor: 148299014447