A197731 Decimal expansion of 2*Pi/(1 + 4*Pi).

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

Offset

0,1

Comments

Least x > 0 such that sin(b*x) = cos(c*x) (and also sin(c*x) = cos(b*x)), where b=1/4 and c=Pi; see the Mathematica program for a graph and A197682 for a discussion and guide to related sequences.

Links

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

Index entries for transcendental numbers

Example

0.463144158875419443212578229102262461786108876...

Mathematica

b = 1/4; c = Pi;
t = x /. FindRoot[Sin[b*x] == Cos[c*x], {x, .46, .47}]
N[Pi/(2*b + 2*c), 110]
RealDigits[%]  (* A197731 *)
Simplify[Pi/(2*b + 2*c)]
Plot[{Sin[b*x], Cos[c*x]}, {x, 0, .8}]

Crossrefs

Cf. A197682.

Sequence in context: A185442 A204174 A086467 * A325009 A325017 A338147

Adjacent sequences: A197728 A197729 A197730 * A197732 A197733 A197734

Keyword

nonn,cons

Author

Clark Kimberling, Oct 17 2011

Status

approved