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 A210414 #33 Apr 18 2021 02:15:20 %S A210414 3,10,6,20,9,100,14,30,18,40,50,24,60,28,70,80,34,90,38,1000,39,46, %T A210414 101,110,54,102,59,200,64,103,69,300,74,104,79,400,84,105,89,500,94, %U A210414 106,99,100000000,1010,108,112,121,201,127,202,133,203,139,204,145,205,151 %N A210414 List the positions of all digits 0 in the concatenation of all terms, not necessarily in order. This is the lexicographically earliest such sequence. %C A210414 See A210415 for comments, links, and code. %H A210414 Danny Rorabaugh, <a href="/A210414/b210414.txt">Table of n, a(n) for n = 1..1000</a> %e A210414 The sequence cannot start with 0 (offset starting from 1), 1 (in the first position we have 1, not 0) or 2 (the second entry cannot start with 0). So the sequence starts with 3. The next term is 10, which is the minimum number with 0 as its second digit. And so on. %Y A210414 Cf. A210415-A210423. See A167519 for another version. %K A210414 nonn,base %O A210414 1,1 %A A210414 _Paolo P. Lava_, Mar 26 2012 %E A210414 Name edited and a(22)-a(58) corrected by _Danny Rorabaugh_, Nov 30 2015