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 A043511 #13 May 31 2021 18:50:05 %S A043511 555,1555,2555,3555,4555,5055,5155,5255,5355,5455,5505,5515,5525,5535, %T A043511 5545,5550,5551,5552,5553,5554,5556,5557,5558,5559,5565,5575,5585, %U A043511 5595,5655,5755,5855,5955,6555,7555,8555,9555,10555 %N A043511 Numbers having three 5's in base 10. %H A043511 Daniel Starodubtsev, <a href="/A043511/b043511.txt">Table of n, a(n) for n = 1..10000</a> %t A043511 Select[Range[555,11000],DigitCount[#,10,5]==3&] (* _Harvey P. Dale_, May 31 2021 *) %Y A043511 Subsequence of A011535. %K A043511 nonn,base %O A043511 1,1 %A A043511 _Clark Kimberling_