%I #5 Mar 17 2023 02:23:15
%S 1,1,1,2,1,3,1,4,3,2,1,6,1,7,3,8,1,9,1,4,3,2,1,12,5,2,9,14,1,6,1,16,3,
%T 2,7,18,1,2,3,8,1,21,1,4,9,2,1,24,7,10,3,4,1,27,5,28,3,2,1,12,1,2,9,
%U 32,5,6,1,4,3,14,1,36,1,2,15,4,7,6,1,16,27,2,1,42,5,2,3,8,1,18,7,4,3,2,5,48
%N a(n) = gcd(n, A064802(n)).
%e a(18) = gcd(18,27) = 9.
%Y Cf. A064802, A094521.
%K easy,nonn
%O 1,4
%A _Marc LeBrun_, May 06 2004