4 891 253 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
376138545159874053049	21	68.3	2018-06-08 05:51:18

ECM

Digits	B1	Curves
25	50000	9 / 280

Estimated T-Level: 20.2 ⓘ

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

Status	Date	User	Residue	Shift
Verified (Factored)	1998-10-11	Blaine Deal	C9A0E9116F292B96	0
Verified (Factored)	2000-03-08	The Prime Hunters	C9A0E9116F292B96	3374083

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2018-07-09	ATH	0C699CB9A07BFAB6	1	2454730	5	3
Verified	2018-07-09	kkmrkkblmbrbk	0C699CB9A07BFAB6	1	775817	5	3
Verified	2018-09-20	marcomich	0C699CB9A07BFAB6	1	2008900	5	3

History

Date	User	Type	Result
2024-08-20	cramsey87	NF-PM1	B1=400000, B2=1009578570
2018-09-20	marcomich	C-PRP	M4891253/376138545159874053049 : 0C699CB9A07BFAB6 PRP: Verified PRP without proof (not generated)
2018-07-09	kkmrkkblmbrbk	C-PRP	M4891253/376138545159874053049 : 0C699CB9A07BFAB6 PRP: Verified PRP without proof (not generated)
2018-07-09	ATH	C-PRP	M4891253/376138545159874053049 : 0C699CB9A07BFAB6 PRP: Verified PRP without proof (not generated)
2018-06-08	Yxinity	F	Factor: 376138545159874053049 / TF: 68-69
2018-05-08	ramgeis	NF	no factor from 2^67 to 2^68
2017-10-31	Yxinity	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2015-07-22	snme2pm1	NF	no factor from 2^65 to 2^66
2015-01-07	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-01-07	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-01-05	David Campeau	NF-PM1	B1=420000, B2=10920000, E=12
2011-09-28	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-07-16	markr	NF	no factor from 2^61 to 2^62
2009-09-12	Carsten Kossendey	NF-PM1	B1=30000, B2=435000