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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A154392 Number of zeros of sin(x^2) in integer intervals starting with (0,1). 0
0, 1, 1, 3, 2, 4, 4, 5, 5, 6, 7, 7, 8, 9, 9, 10, 10, 12, 11, 13 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

First differences of A032616. [From R. J. Mathar, Jan 12 2009]

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

For n = 1, there are no zeros of sin(x^2) in (0,1), so a(1) = 0. For n = 2, there is one zero of sin(x^2) in (1,2) at x = sqrt(pi), or x ~ 1.772, so a(2) = 1.

MATHEMATICA

Join[{0}, Table[CountRoots[Sin[x^2], {x, k, k+1}], {k, 20}]] (* Harvey P. Dale, Dec 24 2018 *)

CROSSREFS

Sequence in context: A326015 A078822 A224980 * A069745 A112199 A145815

Adjacent sequences:  A154389 A154390 A154391 * A154393 A154394 A154395

KEYWORD

nonn

AUTHOR

A. Timothy Royappa, Jan 08 2009

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 21 18:53 EDT 2019. Contains 328308 sequences. (Running on oeis4.)