38 194 643 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 2⁷³

TF target 2⁷¹

P-1

B1 =	600000
B2 =	12000000

Status	Date	User	Residue	Shift	Software
Bad	2008-06-03	C. Cooper / S. Boone	A953F1851F3EB945	1165892	Windows,Prime95,v24 final,NT service,(aka Wc5)
Bad	2016-02-01	Luigi Morelli	82BA302397975021	15478438	CUDALucas v2.05.1
Verified	2016-02-06	ATH	7B3F772C3E2DF16D	19105778	CUDALucas v2.05.1
Verified	2016-02-08	kracker	7B3F772C3E2DF16D	34401590	Windows 64-bit,Prime95,v28.7,build 1

History

Date	User	Type	Result
2022-06-25	Sid & Andy	NF	no factor TF: 72-73
2018-10-20	Architects Cubed	NF	no factor TF: 71-72
2016-02-08	kracker	C-LL	7B3F772C3E2DF16D
2016-02-06	ATH	C-LL	7B3F772C3E2DF16D
2016-02-01	Luigi Morelli	C-LL	82BA302397975021
2014-11-30	Chuck	NF	no factor TF: 70-71
2014-10-28	HBendtz	NF	no factor TF: 69-70
2014-07-13	HBendtz	NF-PM1	B1=600000, B2=12000000, E=12
2008-06-02	curtisc	C-LL	A953F1851F3EB945
2008-04-24	curtisc	NF-PM1	B1=545000
2007-04-07	-anonymous-	NF	no factor TF: 1-69
2006-07-10	ITS	NF	no factor TF: 1-68
2003-09-14	-anonymous-	NF	no factor TF: 1-59
2003-09-09	-anonymous-	NF	no factor TF: 1-60