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%I #14 Apr 24 2021 21:15:54
%S 666,1666,2666,3666,4666,5666,6066,6166,6266,6366,6466,6566,6606,6616,
%T 6626,6636,6646,6656,6660,6661,6662,6663,6664,6665,6667,6668,6669,
%U 6676,6686,6696,6766,6866,6966,7666,8666,9666,10666
%N Numbers having three 6's in base 10.
%H Jens Kruse Andersen, <a href="/A043515/b043515.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Range[0, 10^7], DigitCount[#, 10, 6]==3&] (* _Vincenzo Librandi_, Sep 25 2017 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_