1 389 623 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 6 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
2779247	7	21.4	old
158417023	9	27.2	2008-07-15 09:59:01
12784531601	11	33.6	2008-07-15 09:59:01
2758907889100409	16	51.3	2014-06-21 11:45:20
396587507499037961	18	58.5	2015-01-19 22:55:02
6964448365491818881	19	62.6	2015-01-19 22:55:02

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	105 / 640

Estimated T-Level: 25.8 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-05	Oliver Kruse	0875CD710A642D3D	6	0	1	3
Verified (Factored)	2017-10-25	nokno	0875CD710A642D3D	1	0	1	3
Verified	2017-11-05	kkmrkkblmbrbk	0875CD710A642D3D	6	1255965	1	3

P-1 factors

Date	Factor	B1	B2
2015-01-19	396587507499037961	500000	15000000
2015-01-19	6964448365491818881	500000	15000000

History

Date	User	Type	Result
2023-02-11	Kevin_9611	NF-PM1	B1=2500000, B2=2508840180
2017-11-05	kkmrkkblmbrbk	C-PRP	M1389623/2779247/158417023/12784531601/2758907889100409/396587507499037961/6964448365491818881 : 0875CD710A642D3D PRP: Verified PRP without proof (not generated)
2017-10-25	nokno	C-PRP	M1389623/known_factors : 0875CD710A642D3D PRP: Verified PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1389623/2779247/12784531601/158417023/2758907889100409/396587507499037961/6964448365491818881 : 0875CD710A642D3D PRP: Verified PRP without proof (not generated)
2017-09-30	Oliver Kruse	C-PRP	M1389623/2779247/12784531601/158417023/2758907889100409/396587507499037961/6964448365491818881 : 0875CD710A642D3D PRP without proof (not generated)
2015-01-19	alpertron	F-PM1	Factor: 2762013218376149390716139723555541641 / (P-1, B1=500000, B2=15000000, E=12)
2014-06-21	TJAOI	F	Factor: 2758907889100409
2008-07-15	J Feitsma	F	Factor: 158417023
2008-07-15	J Feitsma	F	Factor: 12784531601