%I #6 Mar 09 2015 09:35:19

%S 3,5,9,17,23,27,29,35,39,41,45,69,77,81,87,101,111,129,135,153,167,

%T 171,173,183,191,195,197,207,215,231,233,237,245,249,279,293,299,311,

%U 321,333,339,341,345,357,359,371,377,395,401,405,419,435

%N Digit '7' 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