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 A387443 #5 Aug 29 2025 10:12:11 %S A387443 9,8,9,8,2,1,4,4,1,8,8,0,9,3,2,7,3,2,3,7,6,0,9,2,0,3,7,7,7,6,7,1,8,7, %T A387443 8,7,3,7,6,5,1,9,3,7,1,9,4,8,7,1,6,6,8,7,8,3,8,6,1,5,4,4,4,9,2,3,6,2, %U A387443 2,3,6,5,7,2,5,3,5,4,0,9,8,6,0,4,4,4,2,3,3,9,8,3,8,3,5,6,6,0,3,5,9,6,8,3,7,7,5,0,2,5,8,5,6,8,1,4,2,1 %N A387443 Decimal expansion of cos(Pi/22). %H A387443 <a href="/index/Al#algebraic_10">Index entries for algebraic numbers, degree 10</a> %F A387443 Equals sin(5*Pi/11) = sqrt( (A387440+1)/2 ). %F A387443 Largest of the 10 real-valued roots of 1024*x^10 -2816*x^8 +2816*x^6 -1232*x^4 +220*x^2 -11 =0. %e A387443 0.98982144188093273238... %Y A387443 Cf. A019689. %K A387443 nonn,cons,new %O A387443 0,1 %A A387443 _R. J. Mathar_, Aug 29 2025