A201653 Decimal expansion of greatest x satisfying 6*x^2 = csc(x) and 0 < x < Pi.

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

Offset

1,1

Comments

See A201564 for a guide to related sequences. The Mathematica program includes a graph.

Links

G. C. Greubel, Table of n, a(n) for n = 1..10000

Example

least:  0.56010069491216076282384133379781207752937450...
greatest:  3.12451991250138769396880196501162499414487...

Mathematica

a = 6; c = 0;
f[x_] := a*x^2 + c; g[x_] := Csc[x]
Plot[{f[x], g[x]}, {x, 0, Pi}, {AxesOrigin -> {0, 0}}]
r = x /. FindRoot[f[x] == g[x], {x, .5, .6}, WorkingPrecision -> 110]
RealDigits[r]   (* A201591 *)
r = x /. FindRoot[f[x] == g[x], {x, 3.1, 3.14}, WorkingPrecision -> 110]
RealDigits[r]   (* A201653 *)

Prog

(PARI) a=6; c=0; solve(x=3, 3.14, a*x^2 + c - 1/sin(x)) \\ G. C. Greubel, Aug 22 2018

Crossrefs

Cf. A201564.

Sequence in context: A108038 A151845 A230448 * A230765 A250306 A120577

Adjacent sequences: A201650 A201651 A201652 * A201654 A201655 A201656

Keyword

nonn,cons

Author

Clark Kimberling, Dec 03 2011

Status

approved