OFFSET
1,1
COMMENTS
8^k + 9 is prime for k = 1, 2, 3, 6, 10, 19, 22, ...
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..9
EXAMPLE
For k=1, 8^1 + 9 = 17;
for n=2, 8^2 + 9 = 73;
for n=3, 8^3 + 9 = 521.
MATHEMATICA
Select[8^Range[120]+9, PrimeQ] (* Harvey P. Dale, Jan 18 2011 *)
PROG
(Magma) [a: n in [0..200] | IsPrime(a) where a is 8^n+9];
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Mar 11 2009
STATUS
approved