A201665 Decimal expansion of greatest x satisfying 2*x^2 - 1 = csc(x) and 0

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

Offset: 1

Author

Clark Kimberling, Dec 04 2011

Keywords

• nonn
• cons

Comments

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

Examples

			least:  1.039245650797247793231929327242483730000...
greatest:  3.086158774377127181225948286358214524...
		

Links

• G. C. Greubel, Table of n, a(n) for n = 1..10000
• Index entries for transcendental numbers.

Crossrefs

Cf. A201564.

Programs

Mathematica

a = 2; c = -1;
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, 1.0, 1.1}, WorkingPrecision -> 110]
RealDigits[r]     (* A201664 *)
r = x /. FindRoot[f[x] == g[x], {x, 3.0, 3.14}, WorkingPrecision -> 110]
RealDigits[r]      (* A201665 *)

PARI

a=2; c=-1; solve(x=3, 3.14, a*x^2 + c - 1/sin(x)) \\ G. C. Greubel, Sep 11 2018