%I A123927
%S A123927 0,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,0,1,0,1,0,1,1,1,0,1,1,1,0,1,0,1,0,1,1,
%T A123927 1,0,1,1,1,0,1,0,1,0,0,1,1,0,1,0,1,0,1,0,1,0,1,1,1,0,1,1,0,1,1,0,1,0,1,
%U A123927 0,1,0,1,1,0,0,1,0,1,0,0,1,1,0,1,1,1,0,1,0,1,0,1,1,1,0,1,0,0,0,1,0,1
%N A123927 Characteristic function of natural numbers with number of divisors equal 
               to a Lucas number.
%H A123927 <a href="Sindx_Ch.html#char_fns">Index entries for characteristic functions</
               a>
%Y A123927 Cf. A119885, A119911.
%Y A123927 Sequence in context: A013595 A011582 A145568 this_sequence A011583 A011584 
               A011585
%Y A123927 Adjacent sequences: A123924 A123925 A123926 this_sequence A123928 A123929 
               A123930
%K A123927 easy,nonn
%O A123927 1,1
%A A123927 Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Nov 22 2006