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 A033026 #10 Aug 13 2021 05:33:18 %S A033026 14,28,42,56,70,84,98,112,126,140,154,168,183,366,549,732,915,1098, %T A033026 1281,1464,1647,1830,2013,2196,2366,2380,2394,2408,2422,2436,2450, %U A033026 2464,2478,2492,2506,2520,2534,4732,4746,4760,4774 %N A033026 Numbers whose base-13 expansion has no run of digits with length < 2. %H A033026 Vincenzo Librandi, <a href="/A033026/b033026.txt">Table of n, a(n) for n = 1..1000</a> %t A033026 Select[Range[10000], Min[Length/@Split[IntegerDigits[#, 13]]]>1&] (* _Vincenzo Librandi_, Feb 05 2014 *) %K A033026 nonn,base %O A033026 1,1 %A A033026 _Clark Kimberling_