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URL: https://oeis.org/A217382

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A217382
Numbers k such that 8^k + 9 is prime.
2
1, 2, 3, 6, 10, 19, 22, 109, 798, 1498, 1519, 3109, 5491, 13351, 26983, 48799, 57909, 98109
OFFSET
1,2
COMMENTS
All terms are equal to 1/3 of the multiples of 3 in A057196.
MATHEMATICA
Select[Range[10000], PrimeQ[8^# + 9] &]
PROG
(PARI) is(n)=ispseudoprime(8^n+9) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Cf. A145440 (associated primes).
Sequence in context: A339808 A089985 A191518 * A378672 A244742 A007473
KEYWORD
nonn,more
AUTHOR
Vincenzo Librandi, Oct 03 2012
EXTENSIONS
a(16)-a(18) from Michael S. Branicky, May 17 2025 using b-file at A057196
STATUS
approved