This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A043514 #15 Apr 24 2021 21:15:27 %S A043514 66,166,266,366,466,566,606,616,626,636,646,656,660,661,662,663,664, %T A043514 665,667,668,669,676,686,696,766,866,966,1066,1166,1266,1366,1466, %U A043514 1566,1606,1616,1626,1636,1646,1656,1660,1661,1662,1663 %N A043514 Numbers having two 6's in base 10. %H A043514 Daniel Starodubtsev, <a href="/A043514/b043514.txt">Table of n, a(n) for n = 1..10000</a> %t A043514 Select[Range[2000],DigitCount[#,10,6]==2&] (* _Harvey P. Dale_, Mar 23 2011 *) %Y A043514 Subsequence of A011536. %K A043514 nonn,base %O A043514 1,1 %A A043514 _Clark Kimberling_