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 A346001 #10 Jul 20 2021 15:41:19 %S A346001 0,11111,22222,33333,44444,55555,66666,77777,88888,99999,101234, %T A346001 110325,123016,132107,145670,154761,167452,176543,202318,213209, %U A346001 220153,231042,246735,257624,264580,275491 %N A346001 Lexicographically earliest sequence of nonnegative integers such that two distinct terms differ by at least 5 decimal digits. %C A346001 This is the distance 5 lexicode over the decimal alphabet. %H A346001 J. H. Conway, <a href="https://doi.org/10.1016/0012-365X(90)90008-6">Integral lexicographic codes</a>, Discrete Mathematics 83.2-3 (1990): 219-235. %H A346001 J. H. Conway and N. J. A. Sloane, <a href="https://doi.org/10.1109/TIT.1986.1057187">Lexicographic codes: error-correcting codes from game theory</a>, IEEE Transactions on Information Theory, 32:337-348, 1986. %p A346001 (See A346000) %Y A346001 Lexicodes of minimal distance 1,2,3,... over alphabets of size 2: A001477, A001969, A075926, A075928, A075931, A075934, ...; size 3: A001477, A346002, A346003; size 10: A001477, A343444, A333568, A346000, A346001. %K A346001 nonn,base %O A346001 1,2 %A A346001 _N. J. A. Sloane_, Jul 20 2021