OFFSET
1,1
LINKS
Jinyuan Wang, Table of n, a(n) for n = 1..1000
PROG
(PARI) for(k=1, 250000000, j=0; while(isprime((3^j)*k+1), j++); if(j>=7, print1(k, ", "))); \\ Rick L. Shepherd, Aug 29 2005
CROSSREFS
KEYWORD
nonn
AUTHOR
Pierre CAMI, Aug 27 2005
EXTENSIONS
More terms from Rick L. Shepherd, Aug 29 2005
STATUS
approved