login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A197733 Decimal expansion of 2*Pi/(1+Pi). 3
1, 5, 1, 7, 0, 9, 3, 9, 8, 5, 9, 8, 9, 5, 5, 2, 2, 9, 0, 6, 8, 8, 8, 6, 1, 3, 7, 8, 0, 8, 9, 7, 8, 5, 7, 2, 8, 2, 7, 6, 8, 5, 2, 7, 3, 1, 2, 8, 1, 0, 6, 1, 9, 9, 3, 3, 3, 7, 9, 7, 6, 4, 2, 7, 5, 6, 5, 0, 9, 6, 2, 7, 4, 2, 0, 1, 9, 1, 4, 7, 5, 2, 6, 4, 1, 2, 6, 6, 3, 4, 8, 0, 3, 0, 7, 1, 1, 5, 4 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

Equals the harmonic mean of 1 and Pi. - Stanislav Sykora, Apr 11 2016

LINKS

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

EXAMPLE

1.51709398598955229068886137808978572827685273...

MATHEMATICA

b = 1/4; c = Pi/4;

t = x /. FindRoot[Sin[b*x] == Cos[c*x], {x, 1.517, 1.518}]

N[Pi/(2*b + 2*c), 110]

RealDigits[%]  (* A197733 *)

Simplify[Pi/(2*b + 2*c)]

Plot[{Sin[b*x], Cos[c*x]}, {x, 0, Pi/2}]

PROG

(PARI) 2*Pi/(1+Pi) \\ Michel Marcus, Apr 11 2016

(MATLAB) 2*pi/(1+pi) \\ Altug Alkan, Apr 11 2016

CROSSREFS

Cf. A074950 (harmonic mean of Pi and e), A197682.

Sequence in context: A275490 A283247 A052345 * A241018 A111008 A065330

Adjacent sequences:  A197730 A197731 A197732 * A197734 A197735 A197736

KEYWORD

nonn,cons

AUTHOR

Clark Kimberling, Oct 17 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified June 22 12:17 EDT 2017. Contains 288613 sequences.