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 A387450 #11 Aug 31 2025 10:24:56 %S A387450 9,9,5,4,7,1,9,2,2,5,7,3,0,8,4,6,0,4,7,2,6,2,5,5,2,8,1,1,2,9,9,3,0,6, %T A387450 1,5,7,5,7,5,2,6,8,6,6,0,7,9,4,9,7,4,3,5,0,9,5,3,5,4,2,4,7,6,1,5,6,5, %U A387450 8,9,5,7,4,8,9,8,2,7,8,0,8,3,9,3,5,2,9,1,7,0,1,8,1,8,8,8,3,9,0,0,7,9,0,6,7,7,9,5,3,7,0,6,6,7,3,0,7,3 %N A387450 Decimal expansion of cos(Pi/33). %H A387450 R. J. Mathar, <a href="https://vixra.org/abs/2210.0026">Reduction formulas of the cosine of integer fractions of pi</a>, (2008) vixra:2210.0026 %H A387450 <a href="/index/Al#algebraic_10">Index entries for algebraic numbers, degree 10</a> %F A387450 Equals sin(31*Pi/66) = 2F1(-1/22,1/22;1/2;3/4). %F A387450 Largest of the 10 real-valued roots of 1024*x^10 +512*x^9 -2560*x^8 -1280*x^7 +2176*x^6 +1088*x^5 -688*x^4 -344*x^3 +48*x^2 +24*x +1 =0. %F A387450 4*this^3 -3*this = A387440. %e A387450 0.99547192257308460473... %K A387450 nonn,cons,new %O A387450 0,1 %A A387450 _R. J. Mathar_, Aug 29 2025