8 327 243 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
170426610261108079561	21	67.2	2018-01-15 00:45:09

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	Software
Factored	1999-12-01	Lee Henderson	4DBDC5E630272C8A	909387	Windows,Prime95,v18,(aka WU1)
Factored	2002-09-07	Ars Technica Team Prime Rib	4DBDC5E630272C8A	4397514	Windows,Prime95,v21,(aka WX1)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2018-10-16	Oliver Kruse	F03B73B56262AA08	1	7295557	5	3
Verified	PRP without proof (not generated)	2020-04-20	marssystems	F03B73B56262AA08	1	2006056	5	3

History

Date	User	Type	Result
2025-03-14	beep	NF-PM1	B1=1750000, B2=6798611820
2020-04-20	marssystems	C-PRP	M8327243/170426610261108079561 : F03B73B56262AA08
2018-10-16	Oliver Kruse	C-PRP	M8327243/170426610261108079561 : F03B73B56262AA08
2018-01-15	monst	F	Factor: 170426610261108079561 / TF: 67-68*
2015-12-26	snme2pm1	NF	no factor TF: 66-67
2015-05-28	VictordeHollander	NF	no factor TF: 65-66
2014-01-07	David Campeau	NF	no factor TF: 64-65
2012-07-31	firejuggler	NF-PM1	B1=95000, B2=1662500, E=6
2002-09-07	Team Prime Rib	C-LL	4DBDC5E630272C8A
2002-08-31	Team Prime Rib	NF	no factor TF: 1-64
2002-08-31	Team Prime Rib	NF-PM1	B1=40000, B2=640000
1999-12-01	-anonymous-	C-LL	4DBDC5E630272C8A
1999-01-29	pheede	NF	no factor TF: 1-63
1998-11-14	Sturle Sunde	NF	no factor TF: 1-62