75 140 239 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷⁵

TF target 2⁷⁴

P-1

B1 =	655000
B2 =	13100000

Status	Date	User	Residue	Shift	Software
Verified	2017-04-16	Mike McCurdy	83576B4454CC9243	17446128	Windows 64-bit,Prime95,v26.6,build 3
Verified	2025-03-18	Pavel Bogdanov	83576B4454CC9243	62137869	Windows 64-bit,Prime95,v30.19,build 20

History

Date	User	Type	Result
2025-03-18	Pavel Bogdanov	C-LL	83576B4454CC9243
2017-04-16	Mike McCurdy	C-LL	83576B4454CC9243
2015-11-27	Summy	NF-PM1	B1=655000, B2=13100000, E=12
2015-11-26	gcardona	NF	no factor TF: 74-75
2015-11-26	gcardona	NF	no factor TF: 73-74
2015-11-26	gcardona	NF	no factor TF: 72-73
2015-08-31	Judge Hale	NF	no factor TF: 71-72
2014-03-15	SMoffat	NF	no factor TF: 70-71
2012-12-05	GrunwalderGIMP	NF	no factor TF: 69-70
2010-08-08	DigiK-oz	NF	no factor TF: 68-69
2010-08-07	lindee	NF	no factor TF: 67-68
2010-07-29	lindee	NF	no factor TF: 66-67
2010-07-28	-anonymous-	NF	no factor TF: 65-66
2004-12-23	Marzbug	NF	no factor TF: 1-65
2004-11-22	Marzbug	NF	no factor TF: 1-65
2004-04-20	Marzbug	NF	no factor TF: 1-63
2003-06-30	Marzbug	NF	no factor TF: 1-63