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A198838
Decimal expansion of x>0 satisfying x^2-4*cos(x)=1.
2
1, 3, 5, 8, 0, 9, 2, 3, 4, 9, 7, 9, 6, 9, 3, 5, 9, 1, 5, 2, 2, 9, 3, 4, 4, 7, 8, 2, 9, 4, 8, 7, 3, 2, 1, 8, 3, 3, 8, 3, 9, 9, 6, 9, 6, 0, 5, 6, 2, 0, 9, 2, 1, 9, 2, 8, 5, 9, 0, 0, 7, 8, 6, 1, 2, 0, 3, 9, 1, 1, 8, 7, 3, 4, 6, 8, 2, 7, 7, 9, 1, 2, 0, 2, 0, 7, 7, 2, 7, 5, 8, 6, 3, 6, 8, 4, 6, 4, 1
OFFSET
1,2
COMMENTS
See A198755 for a guide to related sequences. The Mathematica program includes a graph.
EXAMPLE
x=1.358092349796935915229344782948732183383...
MATHEMATICA
a = 1; b = -4; c = 1;
f[x_] := a*x^2 + b*Cos[x]; g[x_] := c
Plot[{f[x], g[x]}, {x, -3, 3}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, 1.3, 1.4}, WorkingPrecision -> 110]
RealDigits[r] (* A198838 *)
CROSSREFS
Cf. A198755.
Sequence in context: A268694 A068825 A019730 * A374774 A089103 A189964
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Oct 30 2011
STATUS
approved