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 A216400 #17 Jun 21 2022 05:08:04 %S A216400 0,1,199981,199982,199983,199984,199985,199986,199987,199988,199989, %T A216400 199990,200000,200001,1599981,1599982,1599983,1599984,1599985,1599986, %U A216400 1599987,1599988,1599989,1599990,2600000,2600001,13199998,28263827,35000000,35000001,35199981 %N A216400 Numbers k such that the number of times digit 'm' used for writing the decimal representation between 1 to k is equal to k for at least one value of m in the range m = 1 to 9. %H A216400 V. Raman, <a href="/A216400/b216400.txt">Table of n, a(n) for n = 1..590</a> %F A216400 Union of A014778, A101639, A101640, A101641, A130427, A130428, A130429, A130430, A130431. %Y A216400 Cf. A014778, A101639, A101640, A101641, A130427, A130428, A130429, A130430, A130431, A130432. %K A216400 nonn,base,fini,full,less %O A216400 1,3 %A A216400 _V. Raman_, Sep 06 2012