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 A161823 #5 Jan 07 2023 14:47:57 %S A161823 90,60,45,36,30,26,23,20,18,17,15,14,13,12,12,11,10,10,9,9,9,8,8,8,7, %T A161823 7,7,7,6,6,6,6,6,6,5,5,5,5,5,5,5,5,5,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,3, %U A161823 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,2,2,2,2,2,2,2,2 %N A161823 Among any n lines on the plane, there exists a pair at an angle not more than a(n) degrees. %F A161823 a(n) = ceiling(180/n) for n > 1. %K A161823 nonn %O A161823 2,1 %A A161823 _Srikanth K S_, Jun 20 2009