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 A024883 #15 Apr 21 2018 18:16:06 %S A024883 0,0,3,5,7,11,13,17,30,36,46,50,60,70,74,84,117,131,139,157,171,177, %T A024883 193,207,221,237,294,310,330,348 %N A024883 Duplicate of A024328. %K A024883 dead %O A024883 1,3