8 329 267 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 2⁶⁸

Factored

Factor	Digits	Bits	Date
61205739286686096257	20	65.7	2011-02-06 06:44:55

Status	Date	User	Residue	Shift	Software
Factored	1999-11-17	David Tsao	6788F9F8E4BC79EE	2035012	Windows,Prime95,v19,(aka WV1)
Factored	2002-12-09	Marc Getty / Phil Fizur	6788F9F8E4BC79EE	914314	Windows,Prime95,v21,NT service,(aka WX5)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2018-10-17	Oliver Kruse	42C89AD556389153	1	7798644	5	3
Verified	PRP without proof (not generated)	2020-04-21	ATH	42C89AD556389153	1	8258698	5	3

History

Date	User	Type	Result
2025-01-02	Stef42	NF-PM1	B1=1125000, B2=1644906900
2020-04-21	ATH	C-PRP	M8329267/61205739286686096257 : 42C89AD556389153
2018-10-17	Oliver Kruse	C-PRP	M8329267/61205739286686096257 : 42C89AD556389153
2011-02-06	Carsten Kossendey	F	Factor: 61205739286686096257
2002-12-09	-anonymous-	C-LL	6788F9F8E4BC79EE
2002-08-31	Amperio	NF-PM1	B1=35000, B2=35000
2002-05-05	Dave Zook	NF	no factor TF: 1-64
1999-11-17	-anonymous-	C-LL	6788F9F8E4BC79EE
1999-09-22	Dave Zook	NF	no factor TF: 1-64
1998-11-28	-anonymous-	NF	no factor TF: 1-63
1998-09-06	-anonymous-	NF	no factor TF: 1-62
1998-09-06	-anonymous-	NF	no factor TF: 1-61