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A217382 Numbers n such that 8^n + 9 is prime. 2
1, 2, 3, 6, 10, 19, 22, 109, 798, 1498, 1519, 3109, 5491, 13351, 26983 (list; graph; refs; listen; history; text; internal format)
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: A240802 A089985 A191518 * A244742 A007473 A014595

Adjacent sequences:  A217379 A217380 A217381 * A217383 A217384 A217385

KEYWORD

nonn,more

AUTHOR

Vincenzo Librandi, Oct 03 2012

STATUS

approved

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Last modified January 17 20:36 EST 2020. Contains 330987 sequences. (Running on oeis4.)