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%I #7 Dec 15 2017 17:36:32
%S 0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,1,1,0,0,0,1,1,0,1,1,1,1,0,1,0,0,0,0,
%T 0,1,0,1,0,0,0,0,1,0,0,1,0,0,0,0,0,1,1,1,0,0,0,1,0,0,1,0,1,0,0,0,0,0,
%U 1,0,0,0,0,0,0,0,0,2,1,1,1,2,2,1,1,1,1,1,1,0,0,0,0,1,0,0,0,1,0,0,0,0,1,1,0
%N Number of 3's in decimal expansion of triangular number n(n+1)/2.
%t DigitCount[#,10,3]&/@Accumulate[Range[0,110]] (* _Harvey P. Dale_, Aug 01 2017 *)
%Y Cf. 0's A086071, 1's A086072, 2's A086073, 4's A086075, 5's A086076, 6's A086077, 7's A086078, 8's A086079, 9's A086080.
%K base,nonn
%O 0,78
%A _Jason Earls_, Jul 08 2003
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