2 661 833 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
926905129943732714329	21	69.7	2012-12-04 15:14:09

ECM

Digits	B1	Curves
25	50000	182 / 280

Estimated T-Level: 23.3 ⓘ

TF below 2^72 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Ken Kriesel	563DF411D35B8546	0
Verified (Factored)	1999-05-02	Ralph Giles	563DF411D35B8546	537729

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-18	Oliver Kruse	243AB2A8E5303DAE	1	1215086	5	3
Verified	2017-12-03	kkmrkkblmbrbk	243AB2A8E5303DAE	1	1544215	5	3

History

Date	User	Type	Result
2019-07-04	alpertron	NF-PM1	B1=2000000, B2=60000000, E=12
2017-12-03	kkmrkkblmbrbk	C-PRP	M2661833/926905129943732714329 : 243AB2A8E5303DAE PRP: Verified PRP without proof (not generated)
2017-10-18	Oliver Kruse	C-PRP	M2661833/926905129943732714329 : 243AB2A8E5303DAE PRP: Verified PRP without proof (not generated)
2012-12-04	Torchwood Institute	F-ECM	Factor: 926905129943732714329
2012-05-28	Grant McCracken	NF	no factor from 2^61 to 2^62
2011-01-26	James Heinrich	NF-PM1	B1=250000, B2=8000000
2009-06-24	USAFSS	NF-PM1	B1=30000, B2=420000
2009-01-27	Sturle Sunde	NF	no factor from 2^60 to 2^61