The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A197725 Decimal expansion of (pi^2)/(4+pi). 2
 1, 3, 8, 1, 9, 8, 9, 2, 6, 7, 6, 3, 6, 0, 2, 2, 7, 4, 2, 1, 0, 4, 5, 5, 7, 8, 8, 5, 2, 2, 4, 6, 4, 9, 3, 4, 9, 0, 0, 0, 4, 1, 9, 6, 2, 6, 4, 2, 4, 3, 4, 8, 8, 5, 5, 9, 1, 1, 1, 4, 5, 1, 1, 9, 8, 0, 4, 4, 5, 5, 5, 5, 3, 9, 5, 0, 5, 9, 6, 6, 0, 7, 8, 8, 0, 6, 3, 2, 9, 9, 3, 5, 9, 4, 4, 1, 1, 7, 2 (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=1/2 and c=2/pi; see the Mathematica program for a graph and A197682 for a discussion and guide to related sequences. LINKS EXAMPLE x=1.38198926763602274210455788522464934900041... MATHEMATICA b = 1/2; c = 2/Pi; t = x /. FindRoot[Sin[b*x] == Cos[c*x], {x, 1.37, 1.39}] N[Pi/(2*b + 2*c), 110] RealDigits[%]  (* A197725 *) Simplify[Pi/(2*b + 2*c)] Plot[{Sin[b*x], Cos[c*x]}, {x, 0, 2.8}] RealDigits[Pi^2/(4+Pi), 10, 120][[1]] (* Harvey P. Dale, Jul 01 2013 *) CROSSREFS Cf. A197682. Sequence in context: A094874 A132338 A132702 * A288875 A152230 A181371 Adjacent sequences:  A197722 A197723 A197724 * A197726 A197727 A197728 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 31 02:18 EDT 2020. Contains 334747 sequences. (Running on oeis4.)