1 992 251 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
117236949552258819743	21	66.7	2011-02-01 22:17:58
304201680782632484297	21	68.0	2021-04-13 19:19:44

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)		Esa-Pekka Suomalainen	EC7EF07EB204A948	0
Verified (Factored)	1999-01-02	Bruce Mitchell	EC7EF07EB204A948	1286216

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-05	Oliver Kruse	8401786264642430	1	0	1	3
Verified (Factored)	2017-11-12	kkmrkkblmbrbk	8401786264642430	1	1082042	1	3
Verified	2021-04-13	SRJ2877	2C748BC9C34A3094	2	1966882	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
2021-04-13	Ben Delo	CERT	PRP Certification Proof certified good
2021-04-13	SRJ2877	C-PRP	M1992251/117236949552258819743/304201680782632484297 : 2C748BC9C34A3094 PRP proof power = 7 PRP: Verified Proof certified good
2021-04-13	_p95holder_	F-ECM	Factor: 304201680782632484297 / (ECM curve 7, B1=50000, B2=5000000)
2017-11-12	kkmrkkblmbrbk	C-PRP	M1992251/117236949552258819743 : 8401786264642430 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-05	Oliver Kruse	C-PRP	M1992251/117236949552258819743 : 8401786264642430 PRP: Verified (Factored) PRP without proof (not generated)
2011-02-01	arnaud	F-ECM	Factor: 117236949552258819743
2009-12-10	S485122	NF	no factor from 2^60 to 2^61