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 A206291 #33 Jul 02 2023 02:00:47 %S A206291 4,5,6,6,2,4,7,0,4,5,6,7,6,3,0,8,2,4,4,3,7,6,9,7,4,5,7,1,2,8,4,5,7,3, %T A206291 7,5,8,9,8,2,3,1,6,1,3,8,9,2,2,5,6,3,2,5,2,4,2,2,7,8,2,3,0,7,7,3,4,5, %U A206291 3,8,6,2,9,0,0,6,4,2,2,9,7,0,2,9,1,4,3,1,8,9,9,3,0,1,7,7,1,5,8,8,6,8,4,6,1 %N A206291 Decimal expansion of the middle zero x(2) of the function F(x) = f(f(x)) - x, where f(x) = cos(x) - sin(x). %C A206291 The decimal expansions of the other two zeros (x(1) and x(3)) of F(x) are A216891 and A216863, respectively. See the Comments at A216891 for more information on the properties of these zeros. %H A206291 R. Witula, D. Slota and Szeged Problem Group "Fejentalaltuka", <a href="https://www.jstor.org/stable/40391181">An Iteration Convergence: 11318[2007,745]</a>, Amer. Math. Monthly, 116, No. 7 (2009), 648-649. %e A206291 We have f(x(2)) = x(2) = 0.45662470456763..., sin(x(2)) = 0.4409211... and x(2) - sin(x(2)) > 0.015703... %Y A206291 Cf. A216891, A216863, A215668, A215670, A215832, A215833, A168546. %K A206291 nonn,cons %O A206291 0,1 %A A206291 _Roman Witula_, Sep 22 2012