48 042 073 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 2⁷²

P-1

B1 =	565000
B2 =	15678750

Status	Date	User	Residue	Shift	Software
Bad	2009-06-05	xyy_10102	9BD0ABD09785CA32	27074263	Windows,Prime95,v25.7,build 3
Verified	2009-12-28	smb	14CF8600A92FB251	46222175	Windows,Prime95,v25.9,build 4
Verified	2016-08-26	AirSquirrels	14CF8600A92FB251	0	clLucas v1.04

History

Date	User	Type	Result
2017-12-15	Mark Rose	NF	no factor TF: 72-73
2016-08-26	AirSquirrels	C-LL	14CF8600A92FB251
2015-08-16	Sid & Andy	NF	no factor TF: 71-72
2015-08-09	Mark Rose	NF	no factor TF: 70-71
2015-07-24	Sid & Andy	NF	no factor TF: 69-70
2009-12-28	smb	C-LL	14CF8600A92FB251
2009-06-05	xyy_10102	C-LL	9BD0ABD09785CA32
2008-12-25	xyy_10102	NF-PM1	B1=565000, B2=15678750
2008-04-24	PrimeCruncher	NF	no factor TF: 1-69
2003-10-08	Thomas Mullen	NF	no factor TF: 1-60
2003-06-09	Thomas Mullen	NF	no factor TF: 1-59