%I #6 Mar 09 2015 09:35:19
%S 3,9,15,21,27,29,33,51,63,75,77,83,87,89,95,105,107,129,131,161,165,
%T 173,179,189,195,201,203,207,227,237,251,255,257,263,269,285,287,315,
%U 321,329,335,363,377,383,389,399,413,431,441,443,455,461
%N Digit '4' concatenated with a(n) is a lucky number.
%Y Cf. A000959.
%K nonn,base,less
%O 1,1
%A _Patrick De Geest_, May 15 1998