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 A043517 #17 Apr 24 2021 21:16:39 %S A043517 7,17,27,37,47,57,67,70,71,72,73,74,75,76,78,79,87,97,107,117,127,137, %T A043517 147,157,167,170,171,172,173,174,175,176,178,179,187,197,207,217,227, %U A043517 237,247,257,267,270,271,272,273,274,275,276 %N A043517 Numbers having one 7 in base 10. %H A043517 Enrique Pérez Herrero, <a href="/A043517/b043517.txt">Table of n, a(n) for n = 1..2000</a> %H A043517 <a href="/index/Ar#10-automatic">Index entries for 10-automatic sequences</a>. %t A043517 Select[Range[9000],DigitCount[#,10,7]==1&] %Y A043517 Cf. A043489, A043493, A043497, A043501, A043505, A043509, A043513, A043521, A043525, A011537. %K A043517 nonn,base,easy %O A043517 1,1 %A A043517 _Clark Kimberling_