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All terms are equal to 1/3 of the multiples of 3 in A057196.
Table of n, a(n) for n=1..15.
Select[Range, PrimeQ[8^# + 9] &]
(PARI) is(n)=ispseudoprime(8^n+9) \\ Charles R Greathouse IV, Jun 13 2017
Cf. A057196, A217354, A217355.
Cf. A145440 (associated primes).
Sequence in context: A240802 A089985 A191518 * A244742 A007473 A014595
Adjacent sequences: A217379 A217380 A217381 * A217383 A217384 A217385
Vincenzo Librandi, Oct 03 2012