4 133 911 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
7638447726492564767	19	62.7	2011-07-01 19:15:12

ECM

Digits	B1	Curves
25	50000	3 / 280

Estimated T-Level: 20.1 ⓘ

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

Status	Date	User	Residue	Shift
Verified (Factored)	1998-09-06	Robert Clark	81FA8BE0ACCB735E	0
Verified (Factored)	2000-01-19	Darryl W. Stout	81FA8BE0ACCB735E	2247968

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-20	kkmrkkblmbrbk	EFC92696DC90CC73	1	0	1	3
Verified	2018-01-13	Oliver Kruse	EFC92696DC90CC73	1	2618851	1	3

History

Date	User	Type	Result
2023-01-25	USAFSS	NF-PM1	B1=331000, B2=224101020
2018-01-13	Oliver Kruse	C-PRP	M4133911/7638447726492564767 : EFC92696DC90CC73 PRP: Verified PRP without proof (not generated)
2017-09-20	kkmrkkblmbrbk	C-PRP	M4133911/7638447726492564767 : EFC92696DC90CC73 PRP: Verified PRP without proof (not generated)
2011-07-01	GrunwalderGIMP	F-ECM	Factor: 7638447726492564767
2010-12-14	Grant McCracken	NF	no factor from 2^61 to 2^62
2009-07-30	Carsten Kossendey	NF-PM1	B1=25000, B2=325000