8 217 973 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite, with 1 known prime factor. Cofactor is composite.

Trial Factored to 2⁶⁸

TF target 2⁶⁷

Factored

Factor	Digits	Bits	Date
9325259729729635697	19	63.0	2011-08-08 06:11:56

Status	Date	User	Residue	Shift	Software
Factored	1999-11-04	Stephen Wood	2ADB57D3A3FE43B9	4659014	Linux 32-bit,Prime95,v18,(aka WU2)
Factored	2003-03-16	Ars Technica Team Prime Rib	2ADB57D3A3FE43B9	7305120	Windows,Prime95,v23,(aka WZ1)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2018-09-17	Dylan Delgado	435C6598A3604518	1	2203048	5	3
Verified	PRP without proof (not generated)	2020-03-16	GAN	435C6598A3604518	1	6135932	5	3

History

Date	User	Type	Result
2025-03-10	beep	NF-PM1	B1=1750000, B2=6672654450
2023-05-11	This -Anonymous-	NF-PM1	B1=100000, B2=2000000, E=6
2020-03-16	GAN	C-PRP	M8217973/9325259729729635697 : 435C6598A3604518
2018-09-17	Dylan Delgado	C-PRP	M8217973/9325259729729635697 : 435C6598A3604518
2011-08-08	Carsten Kossendey	F	Factor: 9325259729729635697
2011-08-08	Carsten Kossendey	NF	no factor TF: 63-64
2003-03-16	Team Prime Rib	C-LL	2ADB57D3A3FE43B9
2002-08-10	Team Prime Rib	NF-PM1	B1=45000, B2=753750, E=4
1999-11-04	Stephen Wood	C-LL	2ADB57D3A3FE43B9
1999-03-15	-anonymous-	NF	no factor TF: 1-63
1998-08-30	-anonymous-	NF	no factor TF: 1-62