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 A050682 #24 Sep 04 2021 21:08:18 %S A050682 9,20,22,24,28,33,40,46,56,61,72,87 %N A050682 Positions of 5's in A048288. %H A050682 Patrick De Geest, <a href="http://www.worldofnumbers.com/revfact.htm">Reversed Smarandache Concatenated Numbers, Prime factors from n down to 1</a> %H A050682 M. Fleuren, <a href="http://www.gallup.unm.edu/~smarandache/michafleuren.htm">Factors and primes of Smarandache sequences</a>. %H A050682 M. Fleuren, <a href="http://www.gallup.unm.edu/~smarandache/micha.txt">Smarandache Factors and Reverse factors</a> %H A050682 Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_008.htm">Puzzle 8. Primes by Listing</a>, The Prime Puzzles and Problems Connection. %Y A050682 Cf. A000422, A046464, A048288, A050679, A050680, A050681. %K A050682 nonn,base,hard,less,more %O A050682 1,1 %A A050682 _Patrick De Geest_, Aug 15 1999 %E A050682 a(11)-a(12) from _Sean A. Irvine_, Aug 17 2021 %E A050682 Offset changed to 1 by _Jinyuan Wang_, Sep 04 2021