7 128 503 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
3551413803371349228698748863	28	91.5	2012-10-23 02:05:35

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)	1999-04-13	Joel Armengaud	BE204809049E747B	0
Verified (Factored)	2002-09-14	Ars Technica Team Prime Rib	BE204809049E747B	4203862

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2018-02-12	Daniil Tsarkov	C25BB25F0C9B18E5	1	4475473	5	3
Verified	2019-03-23	arnaud	C25BB25F0C9B18E5	1	5646991	5	3

History

Date	User	Type	Result
2019-03-23	arnaud	C-PRP	M7128503/3551413803371349228698748863 : C25BB25F0C9B18E5 PRP: Verified PRP without proof (not generated)
2018-02-12	Daniil Tsarkov	C-PRP	M7128503/3551413803371349228698748863 : C25BB25F0C9B18E5 PRP: Verified PRP without proof (not generated)
2012-10-23	Torchwood Institute	F-ECM	Factor: 3551413803371349228698748863
2011-12-21	James Heinrich	NF-PM1	B1=135000, B2=2902500, E=6