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 A033283 #7 Aug 22 2021 00:12:36 %S A033283 11,22,33,44,55,66,77,88,99,100,110,112,113,114,115,116,117,118,119, %T A033283 122,133,144,155,166,177,188,199,200,211,220,221,223,224,225,226,227, %U A033283 228,229,233,244,255,266,277,288,299,300,311,322 %N A033283 Numbers whose maximal base-10 run length is 2. %K A033283 nonn,base %O A033283 1,1 %A A033283 _Clark Kimberling_