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A199189 Decimal expansion of x>0 satisfying 2*x^2+x*cos(x)=1. 4
5, 2, 2, 9, 4, 5, 9, 4, 6, 1, 1, 3, 1, 1, 1, 7, 3, 7, 2, 4, 7, 6, 2, 3, 8, 3, 6, 3, 5, 9, 8, 1, 1, 2, 3, 7, 1, 3, 9, 7, 3, 4, 5, 2, 5, 8, 0, 0, 2, 6, 0, 5, 9, 9, 0, 2, 3, 1, 1, 5, 7, 6, 4, 5, 8, 7, 4, 4, 7, 0, 8, 0, 0, 7, 9, 9, 6, 3, 1, 5, 6, 5, 3, 7, 1, 0, 3, 2, 7, 5, 4, 8, 5, 0, 6, 5, 8, 0, 1 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

See A199170 for a guide to related sequences.  The Mathematica program includes a graph.

LINKS

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

EXAMPLE

negative: -0.883330197195891938925896450885677107...

positive:  0.522945946113111737247623836359811237139...

MATHEMATICA

a = 2; b = 1; c = 1;

f[x_] := a*x^2 + b*x*Cos[x]; g[x_] := c

Plot[{f[x], g[x]}, {x, -2, 2}, {AxesOrigin -> {0, 0}}]

r = x /. FindRoot[f[x] == g[x], {x, -.84, -.83}, WorkingPrecision -> 110]

RealDigits[r]  (* A199188 *)

r = x /. FindRoot[f[x] == g[x], {x, .52, .53}, WorkingPrecision -> 110]

RealDigits[r]  (*  A199189 *)

CROSSREFS

Cf. A199170.

Sequence in context: A200645 A011411 A201328 * A145438 A244290 A175232

Adjacent sequences:  A199186 A199187 A199188 * A199190 A199191 A199192

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Nov 04 2011

STATUS

approved

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Last modified January 22 10:25 EST 2020. Contains 331144 sequences. (Running on oeis4.)