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 A198503 #8 Apr 23 2025 12:36:27
%S A198503 2,4,7,4,5,6,3,5,6,7,7,0,3,8,9,8,7,2,7,3,0,3,2,8,7,7,6,3,3,7,9,9,3,7,
%T A198503 2,5,2,6,1,6,4,9,4,0,2,8,4,0,2,1,2,8,3,8,1,5,0,3,2,6,6,1,6,9,5,3,9,4,
%U A198503 2,8,1,2,1,8,3,3,6,6,1,7,2,0,2,0,5,9,0,5,1,2,0,2,2,1,7,6,2,5,8
%N A198503 Decimal expansion of x>0 having 4*x^2=sin(x).
%C A198503 See A198414 for a guide to related sequences. The Mathematica program includes a graph.
%H A198503 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>.
%e A198503 0.2474563567703898727303287763379937252...
%t A198503 a = 4; b = 0; c = 1;
%t A198503 f[x_] := a*x^2 + b*x; g[x_] := c*Sin[x]
%t A198503 Plot[{f[x], g[x]}, {x, -.2, .4}]
%t A198503 r = x /. FindRoot[f[x] == g[x], {x, .24, .25}, WorkingPrecision -> 110]
%t A198503 RealDigits[r] (* A198503 *)
%Y A198503 Cf. A198414.
%K A198503 nonn,cons
%O A198503 0,1
%A A198503 _Clark Kimberling_, Oct 25 2011