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 A101209 #1 Feb 20 2005 03:00:00 %S A101209 5,11,67,13,41,61,883,313,271,431,5743,193,3511,1583,2131,433,2551, %T A101209 4177,8513,2521,8779,683,10627,1321,29851,1223,3079,9661,49939,661, %U A101209 101681,4129,42703,2857,15401,1621,2887,7297,547,13441,73637,11173 %N A101209 Smallest odd prime p such that n=(p-1)/ord_p(3). %Y A101209 Cf. A101208. %K A101209 nonn %O A101209 1,1 %A A101209 Leigh Ellison (le(AT)maths.gla.ac.uk), Dec 14 2004