1 862 383 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
25185563490442738247	20	64.4	2012-08-27 13:06:06
838841300506144613897	21	69.5	2020-12-31 13:30:44

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	106 / 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	Shift
Verified (Factored)		Luke Welsh	DE1B9B9FD8057B04	0
Verified (Factored)	1998-12-27	Ron Reece	DE1B9B9FD8057B04	1218567

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified (Factored)	2017-10-04	Oliver Kruse	965FADFC43754749	1	0	1	3
Verified (Factored)	2017-11-07	kkmrkkblmbrbk	965FADFC43754749	1	1797944	1	3
Verified	2020-12-31	SRJ2877	E6269D8E93B2E898	2	278445	5	3

History

Date	User	Type	Result
2020-12-31	Team_Inspector	CERT	PRP Certification Proof certified good
2020-12-31	SRJ2877	C-PRP	M1862383/25185563490442738247/838841300506144613897 : E6269D8E93B2E898 PRP proof power = 7 PRP: Verified Proof certified good
2020-12-31	_p95holder_	F-ECM	Factor: 838841300506144613897 / (ECM curve 5, B1=50000, B2=5000000)
2017-11-07	kkmrkkblmbrbk	C-PRP	M1862383/25185563490442738247 : 965FADFC43754749 PRP: Verified (Factored) PRP without proof (not generated)
2017-10-04	Oliver Kruse	C-PRP	M1862383/25185563490442738247 : 965FADFC43754749 PRP: Verified (Factored) PRP without proof (not generated)
2016-03-16	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2012-08-27	Andriy Makukha	F-ECM	Factor: 25185563490442738247
2012-01-06	markr	NF-PM1	B1=275000, B2=6000000, E=12
2011-03-08	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-06	Architects Cubed	NF	no factor from 2^60 to 2^61