

A198347


Decimal expansion of x>0 having 4*x^2=cos(x).


2



4, 7, 1, 8, 8, 7, 6, 4, 8, 2, 4, 7, 7, 8, 4, 3, 4, 4, 7, 0, 6, 5, 7, 4, 4, 4, 7, 6, 8, 6, 5, 6, 7, 7, 7, 7, 4, 8, 1, 0, 2, 9, 8, 7, 6, 0, 7, 2, 2, 7, 0, 7, 9, 4, 3, 0, 5, 8, 8, 1, 6, 6, 0, 0, 5, 9, 1, 2, 4, 9, 8, 8, 7, 3, 0, 2, 3, 6, 4, 2, 9, 5, 8, 6, 7, 0, 8, 2, 4, 3, 9, 5, 3, 5, 4, 3, 3, 8, 4
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OFFSET

0,1


COMMENTS

See A197737 for a guide to related sequences. The Mathematica program includes a graph.


LINKS

Table of n, a(n) for n=0..98.


EXAMPLE

x=0.471887648247784344706574447686567777...


MATHEMATICA

a = 4; b = 0; c = 1;
f[x_] := a*x^2 + b*x; g[x_] := c*Cos[x]
Plot[{f[x], g[x]}, {x, 1, 1}]
r = x /. FindRoot[f[x] == g[x], {x, .4, .5}, WorkingPrecision > 110]
RealDigits[r] (* A198347 *)


CROSSREFS

Cf. A197737.
Sequence in context: A021216 A335006 A085508 * A019670 A093436 A343805
Adjacent sequences: A198344 A198345 A198346 * A198348 A198349 A198350


KEYWORD

nonn,cons


AUTHOR

Clark Kimberling, Oct 23 2011


STATUS

approved



