A019894 Decimal expansion of sine of 85 degrees.

9, 9, 6, 1, 9, 4, 6, 9, 8, 0, 9, 1, 7, 4, 5, 5, 3, 2, 2, 9, 5, 0, 1, 0, 4, 0, 2, 4, 7, 3, 8, 8, 8, 0, 4, 6, 1, 8, 3, 5, 6, 2, 6, 7, 2, 6, 4, 5, 8, 5, 0, 9, 7, 4, 5, 2, 5, 4, 4, 2, 2, 7, 7, 3, 8, 0, 1, 1, 6, 7, 4, 9, 8, 3, 8, 2, 5, 1, 5, 9, 9, 6, 7, 4, 1, 8, 6, 3, 8, 6, 2, 5, 9, 6, 5, 1, 9, 2, 1

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• cons

Links

• Ivan Panchenko, Table of n, a(n) for n = 0..1000
• Index entries for algebraic numbers, degree 12

Crossrefs

Cf. A019814, A019819, A019826, A019831, A019877, A019882, A019889, A019894.

Programs

Mathematica

RealDigits[Sin[17*Pi/36],10,99][[1]] (* Stefano Spezia, Feb 09 2025 *)

Formula

Equals cos(Pi/36) = 2F1(13/24,11/24;1/2;3/4) / 2 . - R. J. Mathar, Oct 27 2008

Equals A019877 * A019882 + A019826 * A019831 = A019889 * A019894 + A019814 * A019819. - R. J. Mathar, Jan 27 2021