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0,1
An algebraic number of degree 8 and denominator 2. - Charles R Greathouse IV, Aug 27 2017
Ivan Panchenko, Table of n, a(n) for n = 0..1000
Wikipedia, Exact trigonometric constants, Wikipedia
Equals sin(2*Pi/15) = sqrt(1-A019875^2) = 2*A019821*A019887 - R. J. Mathar, Jun 18 2006
(PARI) sin(2*Pi/15) \\ Charles R Greathouse IV, Aug 27 2017
Sequence in context: A066760 A102393 A228131 * A155743 A262246 A194193
Adjacent sequences: A019830 A019831 A019832 * A019834 A019835 A019836
nonn,cons
N. J. A. Sloane.
approved