38 479 709 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 =	400000
B2 =	12000000

Status	Date	User	Residue	Shift	Software
Verified	2007-06-15	Jason Baumgartner	551A60F5DD768B35	17039402	Windows,Prime95,v24 final,(aka Wc1)
Verified	2017-01-23	Dubslow	551A60F5DD768B35	32219761	Linux 64-bit,Prime95,v28.7,build 1

History

Date	User	Type	Result
2024-05-27	LaurV	NF	no factor TF: 68-69
2019-06-01	Sid & Andy	NF	no factor TF: 72-73
2019-04-09	monst	NF	no factor TF: 71-72
2017-01-23	Dubslow	C-LL	551A60F5DD768B35
2016-05-12	HBendtz	NF-PM1	B1=400000, B2=12000000, E=12
2014-12-02	kracker	NF	no factor TF: 70-71
2014-11-25	Mark Rose	NF	no factor TF: 69-70
2013-09-19	Carsten Kossendey	NF	no factor TF: 68-69
2007-06-15	Jason	C-LL	551A60F5DD768B35
2007-05-12	Jason	NF-PM1	B1=615000
2006-07-10	Team Prime Rib	NF	no factor TF: 1-68
2003-09-14	-anonymous-	NF	no factor TF: 1-59
2003-09-14	-anonymous-	NF	no factor TF: 1-60