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 A043496 #20 Dec 25 2023 16:57:15 %S A043496 1111,10111,11011,11101,11110,11112,11113,11114,11115,11116,11117, %T A043496 11118,11119,11121,11131,11141,11151,11161,11171,11181,11191,11211, %U A043496 11311,11411,11511,11611,11711,11811,11911,12111,13111 %N A043496 Numbers having four 1's in base 10. %H A043496 Daniel Starodubtsev, <a href="/A043496/b043496.txt">Table of n, a(n) for n = 1..10000</a> %t A043496 Select[Range[1111,14000],DigitCount[#,10,1]==4&] (* _Harvey P. Dale_, Dec 25 2023 *) %Y A043496 Subsequence of A011531. %K A043496 nonn,base %O A043496 1,1 %A A043496 _Clark Kimberling_