A201325 Decimal expansion of x satisfying 7*x^2 - 1 = cot(x) and 0 < x < Pi.

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

Offset

0,1

Comments

See A201280 for a guide to related sequences. The Mathematica program includes a graph.

Links

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

Example

x=0.5949408761701702040727050575114711009779...

Mathematica

a = 7; c = -1;
f[x_] := a*x^2 + c; g[x_] := Cot[x]
Plot[{f[x], g[x]}, {x, 0, Pi/2}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, .5, .6}, WorkingPrecision -> 110]
RealDigits[r]    (* A201325 *)

Crossrefs

Cf. A201280.

Sequence in context: A198217 A021631 A376009 * A372285 A359485 A135169

Adjacent sequences: A201322 A201323 A201324 * A201326 A201327 A201328

Keyword

nonn,cons

Author

Clark Kimberling, Nov 30 2011

Status

approved