49 948 391 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 2⁷³

P-1

B1 =	575000
B2 =	13656250

Status	Date	User	Residue	Shift	Software
Bad	2011-07-16	dmaine	1DD0D1EFD6E117E1	39322893	Windows 64-bit,Prime95,v26.6,build 3
Verified	2015-07-30	MadPoo 🙂	E261B2EC58AF0BB3	29767581	Windows 64-bit,Prime95,v26,(aka We4)
Verified	2016-10-07	Mark Rose	E261B2EC58AF0BB3	14688697	Linux 64-bit,Prime95,v28.9,build 2

History

Date	User	Type	Result
2017-09-13	Sid & Andy	NF	no factor TF: 72-73
2016-10-07	Mark Rose	C-LL	E261B2EC58AF0BB3
2015-09-10	LaurV	NF	no factor TF: 71-72
2015-07-30	MadPoo 🙂	C-LL	E261B2EC58AF0BB3
2015-06-14	Mark Rose	NF	no factor TF: 70-71
2015-06-02	LaurV	NF	no factor TF: 69-70
2011-07-16	dmaine	C-LL	1DD0D1EFD6E117E1
2011-07-02	dmaine	NF-PM1	B1=575000, B2=13656250
2008-10-14	RMAC9.5	NF	no factor TF: 1-69
2001-10-20	-anonymous-	NF	no factor TF: 1-58
2001-02-18	-anonymous-	NF	no factor TF: 1-57
2000-03-27	-anonymous-	NF	no factor TF: 1-56
2000-02-09	-anonymous-	NF	no factor TF: 1-54
1999-12-23	-anonymous-	NF	no factor TF: 1-53
1999-12-23	-anonymous-	NF	no factor TF: 1-53