39 748 339 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 =	435000
B2 =	5546250

Status	Date	User	Residue	Shift	Software
Verified	2007-12-03	J. Pflug	B2E8CE952A5EBC57	22163587	Windows,Prime95,v25 beta,(aka Wd1)
Verified	2017-04-13	Dubslow	B2E8CE952A5EBC57	24587898	Linux 64-bit,Prime95,v28.7,build 1

History

Date	User	Type	Result
2019-10-11	-anonymous-	NF	no factor TF: 72-73
2019-07-31	monst	NF	no factor TF: 71-72
2017-04-13	Dubslow	C-LL	B2E8CE952A5EBC57
2014-12-15	NickOfTime	NF	no factor TF: 70-71
2014-12-09	Mark Rose	NF	no factor TF: 69-70
2013-10-01	sasaki	NF	no factor TF: 68-69
2007-12-03	-anonymous-	C-LL	B2E8CE952A5EBC57
2007-09-13	-anonymous-	NF-PM1	B1=435000, B2=5546250
2007-02-20	Punmaster	NF	no factor TF: 1-68