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Digit '2' concatenated with a(n) is a lucky number.
1

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

%S 1,5,11,19,23,31,35,37,41,59,61,67,73,83,85,89,97,113,115,121,125,127,

%T 133,163,173,187,209,211,215,217,221,239,251,253,257,271,277,281,283,

%U 301,311,317,323,335,343,355,365,379,395,403,407,409,415

%N Digit '2' concatenated with a(n) is a lucky number.

%Y Cf. A000959.

%K nonn,base,less

%O 1,2

%A _Patrick De Geest_, May 15 1998