%I #6 Mar 09 2015 09:35:20
%S 1,5,7,11,15,21,23,33,37,39,51,59,61,67,73,77,79,89,91,95,97,107,111,
%T 115,121,127,139,151,163,175,179,183,191,195,223,229,231,235,237,251,
%U 257,263,277,283,285,299,301,325,331,335,355,363,365,377,395,399,403
%N Exactly 3 digits from {1,2,3,4,5,6,7,8,9} can precede a(n) to form a lucky number.
%e If n = 111 then we find only '3'111, '6'111 and '7'111 to be lucky numbers.
%Y Cf. A000959.
%K nonn,base,less
%O 1,2
%A _Patrick De Geest_, May 15 1998
