1 992 691 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
5447972584715473055423	22	72.2	2021-11-16 13:40:56
18517218485226652971089	23	74.0	2011-03-03 10:35:37

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	58 / 640

Estimated T-Level: 25.5 ⓘ

TF below 2^80 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Joel Smith	D90F1CB9E31D790E	0
Verified (Factored)	1999-01-17	A. Kromat	D90F1CB9E31D790E	1692263

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-05	Oliver Kruse	734E7C357C7B8B73	1	0	1	3
Verified (Factored)	2017-11-12	kkmrkkblmbrbk	734E7C357C7B8B73	1	1986313	1	3
Verified	2021-11-16	SRJ2877	4F0AFC4720E3BFD9	2	457971	5	3

History

Date	User	Type	Result
2022-08-15	USAFSS	NF-PM1	B1=132000, B2=134381520
2022-03-09	LordJulius	NF	no factor from 2^1 to 2^60
2021-11-19	Alex Landherr	CERT	PRP Certification Proof certified good
2021-11-16	SRJ2877	C-PRP	M1992691/5447972584715473055423/18517218485226652971089 : 4F0AFC4720E3BFD9 PRP proof power = 7 PRP: Verified Proof certified good
2021-11-16	_p95holder_	F-ECM	Factor: 5447972584715473055423 / (ECM curve 6, B1=50000, B2=5000000)
2017-11-12	kkmrkkblmbrbk	C-PRP	M1992691/18517218485226652971089 : 734E7C357C7B8B73 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1992691/18517218485226652971089 : 734E7C357C7B8B73 PRP: Verified (Factored) PRP without proof (not generated)
2011-03-03	kurly	F-PM1	Factor: 18517218485226652971089
2009-12-09	S485122	NF	no factor from 2^60 to 2^61