%I
%S 9,15,5,3,3,1,15,45,1,9,3,5,15,3,1,3,45,5,9,3,1,15,15,1,3,9,5,45,3,1,
%T 3,15,5,3,9,1,45,15,1,3,3,5,15,9,1,9,15,5,3,3,1,15,45,1,9,3,5,15,3,1,
%U 3,45,5,9,3,1,15,15,1,3,9,5,45,3,1,3,15,5,3,9,1,45,15,1,3,3,5,15,9,1,9,15,5,3,3,1,15,45,1,9,3,5,15,3,1,3,45,5,9,3,1,15
%N a(n) = gcd(n^2  19, 45).
%C Has period of length 45: 9,15,5,3,3,1,15,45,1,9,3,5,15,3,1,3,45,5,9,3,1,15,15,1,3,9,5,45,3,1,3,15,5,3,9,1,45,15,1,3,3,5,15,9,1.
%F a(n) = gcd((7n^2+2), (2n^2+7)).
%t Table[GCD[n^2  19, 45], {n, 1, 100}] (* _Stefan Steinerberger_, May 17 2007 *)
%o (PARI) a(n) = gcd(n^2  19, 45); \\ _Michel Marcus_, Mar 23 2016
%K nonn
%O 1,1
%A _Zak Seidov_, May 14 2007, corrected May 16 2007
%E Better definition from _Stefan Steinerberger_, May 17 2007
