8 330 563 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
53645054984021868477193	23	75.5	2020-01-03 11:19:51

P-1 factors

Date	Factors	B1	B2
2020-01-03	53645054984021868477193	260000	5980000

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	1999-12-15	Robert Stalzer	1206B7BAD9F55589	7583656	Windows,Prime95,v18,(aka WU1)
Factored	2003-02-24	Pat Lett	1206B7BAD9F55589	3167212	Windows,Prime95,v21,(aka WX1)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2020-01-03	mrh	9B0DF97BEBBA5633	1	1726513	5	3
Verified	PRP without proof (not generated)	2020-04-21	Igvan28	9B0DF97BEBBA5633	1	3419032	5	3

History

Date	User	Type	Result
2025-03-14	beep	NF-PM1	B1=1750000, B2=6798611820
2020-04-21	Igvan28	C-PRP	M8330563/53645054984021868477193 : 9B0DF97BEBBA5633
2020-01-03	mrh	C-PRP	M8330563/53645054984021868477193 : 9B0DF97BEBBA5633
2020-01-03	Numberwang	F-PM1	Factor: 53645054984021868477193 / B1=260000, B2=5980000
2019-12-08	mnd9	NF	no factor TF: 68-69
2018-01-16	monst	NF	no factor TF: 67-68
2015-12-27	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
2012-08-02	firejuggler	NF-PM1	B1=95000, B2=1662500, E=6
2003-02-24	lettp	C-LL	1206B7BAD9F55589
2002-12-16	Mr P-1	NF-PM1	B1=45000, B2=652500, E=4
2002-08-31	-anonymous-	NF	no factor TF: 1-64
1999-12-15	-anonymous-	C-LL	1206B7BAD9F55589
1999-02-07	Moops	NF	no factor TF: 1-63
1998-09-13	-anonymous-	NF	no factor TF: 1-62