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 A333234 #17 Jul 31 2022 13:57:04 %S A333234 20,40,34,64,76,84,200,106,300,118,210,270,248,124,140,324,221,231, %T A333234 261,338,150,170,186,364,384,341,390,371,424,451,161,481,506,511,548, %U A333234 570,600,551,581,611,628,636,656,664,688,714,694,749,721,750,794 %N A333234 Nonprimes describing the nonprime digits' positions in a way explained in the Comments section. %C A333234 "20" must be read: "At position 2, there is a 0". And indeed, there is, when considering the sequence as a string of concatenated digits; %C A333234 "40" reads: "At position 4, there is a 0" - which is true; %C A333234 "34" reads: "At position 3, there is a 4" - which is also true; %C A333234 ... %C A333234 "200" reads: "At position 20, there is a 0" - which is true (the central 0 in 300); etc. %H A333234 Carole Dubois, <a href="/A333234/b333234.txt">Table of n, a(n) for n = 1..4103</a> %Y A333234 Cf. A264646. %K A333234 base,nonn %O A333234 1,1 %A A333234 _Eric Angelini_ and _Carole Dubois_, Mar 12 2020