A217382 Numbers n such that 8^n + 9 is prime.

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

Offset

1,2

Comments

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

Links

Table of n, a(n) for n=1..15.

Mathematica

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

Prog

(PARI) is(n)=ispseudoprime(8^n+9) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A057196, A217354, A217355.

Cf. A145440 (associated primes).

Sequence in context: A339808 A089985 A191518 * A244742 A007473 A014595

Adjacent sequences: A217379 A217380 A217381 * A217383 A217384 A217385

Keyword

nonn,more

Author

Vincenzo Librandi, Oct 03 2012

Status

approved