8 620 639 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
1031242536645731120273	22	69.8	2019-10-10 18:47:12

ECM

Digits	B1	Curves
25	50000	6 / 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)	1999-12-08	Ryan McGarry	158C287618FE85EC	7945190
Verified (Factored)	2003-02-27	Søren Lund Kristensen	158C287618FE85EC	6587224
Bad	2003-04-19	Ars Technica Team Prime Rib	0B755C024234555A	5280718

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-10-11	mnd9	C77FF6BECEAA2408	1	7750020	5	3
Verified	2019-10-12	theSpirit83	C77FF6BECEAA2408	1	2909435	5	3

History

Date	User	Type	Result
2019-10-12	theSpirit83	C-PRP	M8620639/1031242536645731120273 : C77FF6BECEAA2408 PRP: Verified PRP without proof (not generated)
2019-10-11	mnd9	C-PRP	M8620639/1031242536645731120273 : C77FF6BECEAA2408 PRP: Verified PRP without proof (not generated)
2019-10-10	alan145	F-ECM	Factor: 1031242536645731120273 / (ECM curve 3, B1=50000, B2=5000000, Sigma=2081796263148185)
2018-04-25	monst	NF	no factor from 2^67 to 2^68
2016-02-03	snme2pm1	NF	no factor from 2^66 to 2^67
2015-05-25	VictordeHollander	NF	no factor from 2^65 to 2^66
2014-01-26	lycorn	NF	no factor from 2^64 to 2^65
2012-01-15	bcp19	NF-PM1	B1=100000, B2=1850000, E=6