2 128 303 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
85132121	8	26.3	old
11768838789647	14	43.4	2008-08-26 20:20:45
195005522451758819756023	24	77.4	2021-12-20 08:33:49

ECM

Digits	B1	Curves
25	50000	101 / 280

Estimated T-Level: 21.8 ⓘ

TF below 2^67 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-08	Oliver Kruse	90D01FE140A7C36D	2	0	1	3
Verified (Factored)	2017-11-17	kkmrkkblmbrbk	90D01FE140A7C36D	2	1659446	1	3
Verified	2021-12-20	MarkS	027F9D9C4909958D	3	1379734	5	3

History

Date	User	Type	Result
2021-12-20	S01103	CERT	PRP Certification Proof certified good
2021-12-20	MarkS	C-PRP	M2128303/85132121/11768838789647/195005522451758819756023 : 027F9D9C4909958D PRP proof power = 7 PRP: Verified Proof certified good
2021-12-20	MarkS	F-ECM	Factor: 195005522451758819756023 / (ECM curve 7, B1=50000, B2=5000000, Sigma=5446849267851580)
2017-11-17	kkmrkkblmbrbk	C-PRP	M2128303/85132121/11768838789647 : 90D01FE140A7C36D PRP: Verified (Factored) PRP without proof (not generated)
2017-10-08	Oliver Kruse	C-PRP	M2128303/85132121/11768838789647 : 90D01FE140A7C36D PRP: Verified (Factored) PRP without proof (not generated)
2016-03-16	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2008-08-26	-Anonymous-	F	Factor: 11768838789647