48 538 409 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 =	520000
B2 =	11310000

Status	Date	User	Residue	Shift	Software
Bad	2010-03-24	-anonymous-	F327F1CED30AC69E	32965674	Windows,Prime95,v23,(aka WZ1)
Verified	2016-01-11	MadPoo 🙂	91AE7A8E6A4EB9A4	28869529	Windows 64-bit,Prime95,v26,(aka We4)
Verified	2016-08-22	AirSquirrels	91AE7A8E6A4EB9A4	13860729	CUDALucas v2.05.1

History

Date	User	Type	Result
2018-02-26	monst	NF	no factor TF: 72-73
2016-08-22	AirSquirrels	C-LL	91AE7A8E6A4EB9A4
2016-01-11	MadPoo 🙂	C-LL	91AE7A8E6A4EB9A4
2015-12-02	AirSquirrels	NF	no factor TF: 71-72
2015-12-02	AirSquirrels	NF	no factor TF: 70-71
2010-03-24	-anonymous-	C-LL	F327F1CED30AC69E
2010-03-17	-anonymous-	NF	no factor TF: 1-70
2010-02-05	-anonymous-	NF-PM1	B1=520000, B2=11310000
2010-01-31	-anonymous-	NF	no factor TF: 1-70
2008-05-21	precius1	NF	no factor TF: 1-69
2008-01-15	1997rj7	NF	no factor TF: 1-63
2003-06-06	Thomas Mullen	NF	no factor TF: 1-59