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 A100659 #8 May 10 2021 20:19:59 %S A100659 60,90,108,120,128,135,140,144,147,150,152,154,156,157,158,160,161, %T A100659 162,162,163,164,165,165,166,166,167,167,168,168,168,169,169,169,170, %U A100659 170,170,170,171,171,171,171,171,172,172,172,172,172,172,172,173,173,173,173,173 %N A100659 Floor of measure (in degrees) of the internal angles of a regular polygon with n sides. %F A100659 a(n) = floor(180 - 360/n). - Mark Hudson. %e A100659 a(4) = 90 because all angles of a square measure 90 degrees. %o A100659 (PARI) a(n) = floor((n-2)*180/n); \\ _Michel Marcus_, Aug 27 2013 %Y A100659 Cf. A069976. %K A100659 easy,nonn %O A100659 3,1 %A A100659 Federico Arboleda (federico.arboleda(AT)gmail.com), Jan 02 2005 %E A100659 Edited by Mark Hudson, Jan 05 2005 %E A100659 First term 0 removed by _Michel Marcus_, Aug 27 2013