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 A387453 #5 Aug 31 2025 06:39:22 %S A387453 9,9,4,1,3,7,9,5,7,1,5,4,3,5,9,6,0,8,9,5,5,3,0,2,7,1,5,8,7,9,5,5,1,5, %T A387453 6,6,8,5,4,5,5,9,6,1,8,4,8,1,3,9,3,9,3,8,2,6,4,5,2,0,3,0,2,8,4,2,0,2, %U A387453 8,8,1,1,5,2,3,4,4,1,8,8,8,4,3,8,5,4,2,5,5,3,5,9,7,6,8,6,7,9,3,9,2,4,0,0,6,2,4,3,2,0,9,3,6,8,8,0,4,3 %N A387453 Decimal expansion of cos(Pi/29). %H A387453 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 A387453 <a href="/index/Al#algebraic_14">Index entries for algebraic numbers, degree 14</a> %F A387453 Equals sin(27*Pi/58). %F A387453 Largest of the 14 real-valued roots of 16384*x^14 -8192*x^13 -53248*x^12 +24576*x^11 +67584*x^10 -28160*x^9 -42240*x^8 +15360*x^7 +13440*x^6 -4032*x^5 -2016*x^4 +448*x^3 +112*x^2 -14*x -1 =0. %e A387453 0.99413795715435960896... %K A387453 nonn,cons,new %O A387453 0,1 %A A387453 _R. J. Mathar_, Aug 29 2025