A201288 Decimal expansion of x satisfying x^2 + 9 = cot(x) and 0 < x < Pi.

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

Offset

0,4

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

0.1105084921486828665302132632633308...

Mathematica

a = 1; c = 9;
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, .1, .2}, WorkingPrecision -> 110]
RealDigits[r]   (* A201288 *)

Crossrefs

Cf. A201280.

Sequence in context: A143821 A099219 A343248 * A011441 A372391 A294518

Adjacent sequences: A201285 A201286 A201287 * A201289 A201290 A201291

Keyword

nonn,cons

Author

Clark Kimberling, Nov 29 2011

Extensions

a(96) onwards corrected by Georg Fischer, Aug 03 2021

Status

approved