OFFSET
1,1
COMMENTS
a(17) > 2*10^5. - Robert Price, Sep 29 2013
EXAMPLE
For k = 3, 3^3 - 16 = 11 and 11 is prime. Hence k = 3 is included in the sequence.
MATHEMATICA
Do[If[PrimeQ[3^n - 16], Print[n]], {n, 1, 10000}]
PROG
(PARI) is(n)=isprime(3^n-16) \\ Charles R Greathouse IV, Feb 17 2017
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Nicolas M. Perrault, Nov 10 2012
EXTENSIONS
a(13)-a(16) from Robert Price, Sep 29 2013
STATUS
approved