0,2

An algebraic number of degree 12 and denominator 2. - Charles R Greathouse IV, Aug 27 2017

Ivan Panchenko, Table of n, a(n) for n = 0..1000

Equals 2*A019810*A019898. - R. J. Mathar, Jan 17 2021

0.034899..

(PARI) sin(Pi/90) \\ Charles R Greathouse IV, Aug 27 2017

Sequence in context: A316137 A089290 A296497 * A075746 A275096 A109826

Adjacent sequences: A019808 A019809 A019810 * A019812 A019813 A019814

nonn,cons

N. J. A. Sloane.

Zero added in front by R. J. Mathar, Feb 05 2009

approved