9 666 571 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 2⁶⁹

TF target 2⁶⁸

Factored

Factor	Digits	Bits	Date
34775158322971635209	20	64.9	2011-10-31 15:50:49

Status	Date	User	Residue	Shift	Software
Bad	2000-10-15	jul	954669537D06A60F	4209167	Windows,Prime95,v20,(aka WW1)
Factored	2001-05-20	Salvatore Canzoneri	EF56A2AB12ECBE94	7693048	Windows,Prime95,v20,(aka WW1)
Factored	2004-07-13	Daniel Swanson	EF56A2AB12ECBE94	6156378	Linux 32-bit,Prime95,v23,(aka WZ2)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2019-10-10	mnd9	26B474F824A23D91	1	8817440	5	3
Verified	Certified Good	2020-12-20	storm5510	26B474F824A23D91	1	7741159	5	3

History

Date	User	Type	Result
2025-12-09	Mingye Wang	NF	no factor TF: 68-69
2025-03-08	Prism Daymon	NF-PM1	B1=1260000, B2=6155748060
2020-12-20	Simon Josefsson	CERT	Proof certified good
2020-12-20	storm5510	C-PRP	Proof Certified Good Proof Power: 8
2019-10-10	mnd9	C-PRP	M9666571/34775158322971635209 : 26B474F824A23D91
2011-10-31	James Heinrich	F	Factor: 34775158322971635209
2004-07-13	dswanson	NF-PM1	B1=50000, B2=825000
2004-07-13	dswanson	C-LL	EF56A2AB12ECBE94
2001-05-20	-anonymous-	C-LL	EF56A2AB12ECBE94
2001-03-25	-anonymous-	NF-PM1	B1=105000, B2=1233750
2000-10-15	-anonymous-	C-LL	954669537D06A60F
2000-09-08	-anonymous-	NF-PM1	B1=135000, B2=135000
2000-07-12	-anonymous-	NF	no factor TF: 1-64
2000-05-24	-anonymous-	NF-PM1	B1=135000, B2=135000
1999-11-04	-anonymous-	NF	no factor TF: 1-64