%I #3 Mar 02 2015 16:08:48
%S 1,2,3,4,6,12,17,18,19,20,21,22,23,24,29,31,32,33,34,73,94,96,102,103,
%T 104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,
%U 121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137
%N a(n) = least positive integer > a(n-1) and not a(i)+2*a(j) for 1<=i<j<n.
%Y Cf. A033627, A003278, A026471, A075123.
%K nonn
%O 1,2
%A _Floor van Lamoen_, Sep 02 2002