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Digit '4' concatenated with a(n) is a lucky number.
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%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