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

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 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(b*x) = cos(c*x) (and also sin(c*x) = cos(b*x)), 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 December 3 02:46 EST 2021. Contains 349445 sequences. (Running on oeis4.)