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 A084347 #15 Oct 10 2018 10:07:59 %S A084347 0,1,2,3,4,5,6,7,8,9,10,11,12,14,15,16,18,20,21,22,24,25,27,28,30,32, %T A084347 33,35,36,40,42,44,45,48,49,50,54,55,56,60,63,64,66,70,72,75,77,80,81, %U A084347 84,88,90,96,98,99,100,105,108,110,111,112,120,121,125,126,128,132,135,140 %N A084347 Duplicate of A084034. %K A084347 dead %O A084347 1,3