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 A144920 #21 Jul 21 2020 09:47:30 %S A144920 5,11,17,23,29,41,47,53,59,71,83,89,101,107,113,131,137,149,167,173, %T A144920 179,191,197,227,233,239,251,257,263,269,281,293,311,317,347,353,359, %U A144920 383,389,401,419,431,443,449,461,467,479,491,503,509,521,557,563,569,587 %N A144920 Duplicate of A007528. %K A144920 dead %O A144920 1,1 %A A144920 _N. J. A. Sloane_, Jul 21 2020