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A070747 signum(sin(n)), where signum=A057427. 5
0, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(n) <> 0 for n>0.

LINKS

Table of n, a(n) for n=0..71.

EXAMPLE

n=10: sin(10) = sin(10-2*pi) < 0, as pi < 10-2*pi < 2*pi, therefore a(10) = signum(sin(10)) = -1.

PROG

(PARI) a(n)=(-1)^(n/Pi%2\1) \\ Charles R Greathouse IV, Jun 13 2013

CROSSREFS

Cf. A000493, A000494, A070748, A070751, A070752.

Sequence in context: A011595 A011596 A011597 * A070750 A011598 A324672

Adjacent sequences:  A070744 A070745 A070746 * A070748 A070749 A070750

KEYWORD

sign,easy

AUTHOR

Reinhard Zumkeller, May 04 2002

STATUS

approved

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Last modified October 17 21:57 EDT 2019. Contains 328134 sequences. (Running on oeis4.)