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 A091332 #8 Jan 20 2019 23:18:47
%S A091332 1234,5678,9101,1121,3141,5161,7181,9202,1222,3242,5262,7282,9303,
%T A091332 1323,3343,5363,7383,9404,1424,3444,5464,7484,9505,1525,3545,5565,
%U A091332 7585,9606,1626,3646,5666,7686,9707,1727,3747,5767,7787,9808,1828,3848,5868,7888
%N A091332 Natural numbers written out with their digits grouped in sets of four (leading zeros omitted).
%H A091332 Rémy Sigrist, <a href="/A091332/b091332.txt">Table of n, a(n) for n = 1..10000</a>
%o A091332 (PARI) {c=0; d=[]; for(n=1, 99, while(#d<4, d=concat(d, digits(c++))); print1(sum(i=1,4,d[i]*10^(4-i))", "); d=vecextract(d, "^..4"))} \\ _M. F. Hasler_, Oct 23 2014
%Y A091332 Cf. A059805, A091331.
%K A091332 base,easy,nonn
%O A091332 1,1
%A A091332 J. Taylor (integersfan(AT)yahoo.com), Mar 01 2004