

A197727


Decimal expansion of 2*Pi/(2+Pi).


2



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

1,2


COMMENTS

Least x>0 such that sin(bx)=cos(cx) (and also sin(cx)=cos(bx)), where b=1/2 and c=Pi/4; see the Mathematica program for a graph and A197682 for a discussion and guide to related sequences.
Onehalf of the harmonic mean of 2 and Pi.  Wesley Ivan Hurt, Sep 02 2014


LINKS

Table of n, a(n) for n=1..99.


EXAMPLE

x=1.22203094070331457876119077590793772347484...


MAPLE

Digits:=100: evalf(2*Pi/(2+Pi)); # Wesley Ivan Hurt, Sep 02 2014


MATHEMATICA

b = 1/2; c = Pi/4;
t = x /. FindRoot[Sin[b*x] == Cos[c*x], {x, 1.22, 1.23}]
N[Pi/(2*b + 2*c), 110]
RealDigits[%] (* A197727 *)
Simplify[Pi/(2*b + 2*c)]
Plot[{Sin[b*x], Cos[c*x]}, {x, 0, 2}]


CROSSREFS

Cf. A197682.
Sequence in context: A319109 A217670 A243310 * A176884 A308361 A071443
Adjacent sequences: A197724 A197725 A197726 * A197728 A197729 A197730


KEYWORD

nonn,cons


AUTHOR

Clark Kimberling, Oct 17 2011


STATUS

approved



