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 A216438 #67 Feb 12 2015 04:04:50 %S A216438 27,81,91,135,189,203,221,243,247,273,297,305,309,351,371,377,405,455, %T A216438 459,489,513,515,551,559,567,597,609,621,637,663,675,721,729,741,779, %U A216438 783,815,819,837,891,915,927,945,995,999,1001,1015,1053,1079 %N A216438 Odd composite numbers which do not divide any tribonacci number. %C A216438 Odd composite numbers that do not divide any term of A000213. %H A216438 V. Raman, <a href="/A216438/b216438.txt">Table of n, a(n) for n = 1..132</a> %Y A216438 Cf. A215782, A000213, A215964. %K A216438 nonn %O A216438 1,1 %A A216438 _V. Raman_, Sep 09 2012