%I #17 Jun 13 2017 10:30:08

%S 1,2,3,6,10,19,22,109,798,1498,1519,3109,5491,13351,26983

%N Numbers n such that 8^n + 9 is prime.

%C All terms are equal to 1/3 of the multiples of 3 in A057196.

%t Select[Range[10000], PrimeQ[8^# + 9] &]

%o (PARI) is(n)=ispseudoprime(8^n+9) \\ _Charles R Greathouse IV_, Jun 13 2017

%Y Cf. A057196, A217354, A217355.

%Y Cf. A145440 (associated primes).

%K nonn,more

%O 1,2

%A _Vincenzo Librandi_, Oct 03 2012