4 253 203 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
9558873679937484919	19	63.1	2013-02-17 18:41:15

ECM

Digits	B1	Curves
25	50000	4 / 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)		Paul Victor Novarese	3E5785538DCAB363	0
Bad	1998-07-05	Michael Christner	C01C205670445E64	0
Bad	2000-06-29	Søren Steffensen	FB80CE82526F71E6	2116685
Verified (Factored)	2001-07-22	Michael Shafer	3E5785538DCAB363	1725528

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-20	kkmrkkblmbrbk	3B7789AFA7055382	1	0	1	3
Verified	2018-01-24	Oliver Kruse	3B7789AFA7055382	1	1739720	1	3

History

Date	User	Type	Result
2023-10-02	USAFSS	NF-PM1	B1=319000, B2=173869410
2018-01-24	Oliver Kruse	C-PRP	M4253203/9558873679937484919 : 3B7789AFA7055382 PRP: Verified PRP without proof (not generated)
2017-09-20	kkmrkkblmbrbk	C-PRP	M4253203/9558873679937484919 : 3B7789AFA7055382 PRP: Verified PRP without proof (not generated)
2013-02-17	Xyzzy	F-ECM	Factor: 9558873679937484919
2012-01-31	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2011-01-07	markr	NF	no factor from 2^61 to 2^62
2010-09-04	markr	NF-PM1	B1=95000, B2=2042500, E=6