4 856 869 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
116564857	9	26.8	old
1010228753	10	29.9	2008-09-08 00:15:55
1771348692991	13	40.7	2008-09-30 21:36:26
391130128323531132863	21	68.4	2019-07-04 10:21:01

ECM

Digits	B1	Curves
25	50000	2 / 280

Estimated T-Level: 20.0 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-11-20	kkmrkkblmbrbk	1F667D10A883CEAC	3	4698154	5	3
Verified (Factored)	2018-04-01	kracker	1F667D10A883CEAC	3	1873746	5	3
Verified	2019-07-05	Niels_Mache_Nextcloud	1F667D10A883CEAC	4	2143704	5	3

History

Date	User	Type	Result
2023-08-09	USAFSS	NF-PM1	B1=256000, B2=105522060
2019-07-05	Niels_Mache_Nextcloud	C-PRP	M4856869/116564857/1010228753/1771348692991/391130128323531132863 : 1F667D10A883CEAC PRP: Verified PRP without proof (not generated)
2019-07-04	_p95holder_	F-ECM	Factor: 391130128323531132863 / (ECM curve 2, B1=50000, B2=5000000)
2018-04-01	kracker	C-PRP	M4856869/116564857/1010228753/1771348692991 : 1F667D10A883CEAC PRP: Verified PRP without proof (not generated)
2017-11-20	kkmrkkblmbrbk	C-PRP	M4856869/116564857/1010228753/1771348692991 : 1F667D10A883CEAC PRP: Verified PRP without proof (not generated)
2008-09-30	markr	F	Factor: 1771348692991
2008-09-08	Will Edgington	F	Factor: 1010228753