2 191 291 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
4648240455440944489	19	62.0	2011-01-12 01:45:32

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	167 / 640

Estimated T-Level: 26.3 ⓘ

TF below 2^82 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Jan Peters	EF92C301FDF71F7A	0
Verified (Factored)	1999-02-14	tester	EF92C301FDF71F7A	1766332

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-11	kkmrkkblmbrbk	82951816442DCB66	1	0	1	3
Verified	2017-10-25	Oliver Kruse	82951816442DCB66	1	505194	1	3

History

Date	User	Type	Result
2022-03-09	LordJulius	NF	no factor from 2^1 to 2^60
2017-10-25	Oliver Kruse	C-PRP	M2191291/4648240455440944489 : 82951816442DCB66 PRP: Verified PRP without proof (not generated)
2017-10-11	kkmrkkblmbrbk	C-PRP	M2191291/4648240455440944489 : 82951816442DCB66 PRP: Verified PRP without proof (not generated)
2016-04-02	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2011-01-12	markr	F-PM1	Factor: 4648240455440944489
2010-11-09	Joss	NF-PM1	B1=30000
2010-11-04	Joss	NF-PM1	B1=15000
2009-01-09	Sturle Sunde	NF	no factor from 2^61 to 2^62
2009-01-02	Sturle Sunde	NF	no factor from 2^60 to 2^61