12 739 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

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

Trial Factored to 2⁶⁸

TF target 2⁴⁴

Factored

Factor	Digits	Bits	Date
1146511	7	20.1	old
142164106207	12	37.0	2008-08-26 19:58:38

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	1448 / 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	39FAFEA241E0F094	2	0	1	3
Verified	No proof (small exponent)	2017-10-12	kkmrkkblmbrbk	39FAFEA241E0F094	2	8436	1	3
Verified	No proof (small exponent)	2020-04-17	Oliver Kruse	634F87062BF9EA3C	2	5412	5	3
Verified	No proof (small exponent)	2024-07-01	kkmrkkblmbrbk	634F87062BF9EA3C	2	728	5	3

History

Date	User	Type	Result
2025-03-05	masser	NF-PP1	Start=130/31, B1=430000000, B2=429570000000
2025-02-20	masser	NF-PP1	Start=6/5, B1=430000000, B2=429570000000
2025-01-17	masser	NF-PP1	Start=2/7, B1=430000000, B2=429570000000
2024-07-01	kkmrkkblmbrbk	C-PRP	M12739/1146511/142164106207 : 634F87062BF9EA3C
2023-05-24	-anonymous-	NF-PM1	B1=100000000000, B2=120417199046794650
2023-05-14	JacobZ	NF-PM1	B1=8700000000, B2=36024966470342850
2022-02-05	Joss	NF-PM1	B1=1000000, B2=3910366209750
2020-04-17	Oliver Kruse	C-PRP	M12739/1146511/142164106207 : 634F87062BF9EA3C
2017-10-12	kkmrkkblmbrbk	C-PRP	M12739/1146511/142164106207 : 39FAFEA241E0F094
2017-09-21	Oliver Kruse	C-PRP	M12739/1146511/142164106207 : 39FAFEA241E0F094
2017-09-21	Oliver Kruse	C-PRP	M12739/1146511/142164106207 : 39FAFEA241E0F094
2008-08-26	-anonymous-	F	Factor: 142164106207