OFFSET
1,1
COMMENTS
a(28) > 2*10^5. - Robert Price, Sep 02 2013
MATHEMATICA
Select[Range[2, 5000], PrimeQ[3^# - 8] &]
PROG
(PARI) for(n=2, 5*10^3, if(isprime(3^n-8), print1(n", ")))
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Oct 01 2012
EXTENSIONS
a(18)-a(27) from Robert Price, Sep 02 2013
STATUS
approved