A274239 Numbers n such that 9^n + 8^(n+1) is prime.

1, 2, 5, 20, 53, 161, 380, 500, 530, 698, 832, 833, 6353, 25433, 53921, 73538

Offset

1,2

Comments

a(17) > 10^5.

Links

Table of n, a(n) for n=1..16.

Mathematica

Select[Range[0, 100000], PrimeQ[9^# + 8^(# + 1)] &]

Prog

(Magma) [n: n in [0..500] | IsPrime(9^n+8^(n+1))]; // Vincenzo Librandi, Jul 12 2016
(PARI) is(n)=ispseudoprime(9^n+8^(n+1)) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A093765.

Sequence in context: A098510 A168541 A124264 * A271858 A189734 A221678

Adjacent sequences: A274236 A274237 A274238 * A274240 A274241 A274242

Keyword

nonn,more

Author

Robert Price, Jun 15 2016

Status

approved