2 124 887 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
266877402854723185969	21	67.9	2011-01-24 20:46:40

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	168 / 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)	1997-12-30	Mikko Tommila	86C2C66C3400AF52	0
Verified (Factored)	1999-06-26	Michael Durham	86C2C66C3400AF52	913787

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-08	Oliver Kruse	7017646A42E0BEBA	1	0	1	3
Verified	2017-11-17	kkmrkkblmbrbk	7017646A42E0BEBA	1	1985673	1	3

History

Date	User	Type	Result
2022-03-09	LordJulius	NF	no factor from 2^1 to 2^60
2017-11-17	kkmrkkblmbrbk	C-PRP	M2124887/266877402854723185969 : 7017646A42E0BEBA PRP: Verified PRP without proof (not generated)
2017-10-08	Oliver Kruse	C-PRP	M2124887/266877402854723185969 : 7017646A42E0BEBA PRP: Verified PRP without proof (not generated)
2016-03-16	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2011-01-24	James Heinrich	F-PM1	Factor: 266877402854723185969
2011-01-11	Joss	NF-PM1	B1=50000
2011-01-01	Joss	NF-PM1	B1=30000
2009-08-03	USAFSS	NF-PM1	B1=20000, B2=265000
2009-01-04	Sturle Sunde	NF	no factor from 2^60 to 2^61