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 A161428 #5 Mar 30 2012 17:40:00 %S A161428 4,5,6,7,8,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83, %T A161428 89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173, %U A161428 179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263,269,271,277 %N A161428 a(n) = A161424(n)/4. %Y A161428 Cf. A018253, A160811, A160812, A161205, A161344, A161345, A161346, A161424, A161425. %K A161428 easy,nonn %O A161428 1,1 %A A161428 _Omar E. Pol_, Jun 20 2009 %E A161428 Terms beyond a(8) from _R. J. Mathar_, Jun 24 2009