%I A086078
%S A086078 0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,
%T A086078 0,0,1,1,1,0,0,0,0,0,0,0,0,1,0,1,0,1,0,0,0,0,0,1,2,0,0,0,0,0,0,0,1,0,0,
%U A086078 0,0,0,1,2,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,1,1,0,0,0,1,0,0,0,0,0,0,0
%N A086078 Number of 7's in decimal expansion of triangular number n(n+1)/2.
%Y A086078 Cf. 0's A086071, 1's A086072, 2's A086073, 3's A086074, 4's A086075, 
               5's A086076, 6's A086077, 8's A086079, 9's A086080.
%Y A086078 Sequence in context: A024362 A104488 A010103 this_sequence A014082 A102354 
               A162641
%Y A086078 Adjacent sequences: A086075 A086076 A086077 this_sequence A086079 A086080 
               A086081
%K A086078 base,nonn
%O A086078 0,60
%A A086078 Jason Earls (zevi_35711(AT)yahoo.com), Jul 08 2003