A201574 Decimal expansion of least x satisfying x^2 + 7 = csc(x) and 0 < x < Pi.

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

Offset

0,2

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 = 0..10000

Example

least:  0.14292758299392086700431044307554748240884...
greatest:  3.08092023229520680455935849821275370108...

Mathematica

a = 1; c = 7;
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, .2}, WorkingPrecision -> 110]
RealDigits[r]   (* A201574 *)
r = x /. FindRoot[f[x] == g[x], {x, 3.0, 3.1}, WorkingPrecision -> 110]
RealDigits[r]   (* A201575 *)

Prog

(PARI) a=1; c=7; solve(x=0.1, .2, a*x^2 + c - 1/sin(x)) \\ G. C. Greubel, Aug 21 2018

Crossrefs

Cf. A201564.

Sequence in context: A021237 A115881 A180434 * A077809 A201281 A095303

Adjacent sequences: A201571 A201572 A201573 * A201575 A201576 A201577

Keyword

nonn,cons

Author

Clark Kimberling, Dec 03 2011

Status

approved