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 A108402 #14 Oct 19 2017 10:44:21 %S A108402 3,5,11,17,29,53,89,157,271,487,857,1487,2621,4567,8011,13999,24499, %T A108402 42901,75401,132169,231431,406207,711617,1247761,2186941 %N A108402 Largest prime factor of A023199(n). %Y A108402 Cf. A023199. %K A108402 nonn %O A108402 2,1 %A A108402 _Ed Pegg Jr_, Jul 04 2005; revised Jul 05 2005 %E A108402 271 from _Bodo Zinser_ and _Don Reble_, Jul 05 2005 %E A108402 857 from _Don Reble_, Jul 05 2005 %E A108402 1487, 2621, 4561, 8011, 13999 from _T. D. Noe_, Oct 06 2005 %E A108402 a(15) corrected and sequence extended to a(26) by _T. D. Noe_, Oct 13 2009