A113401 Algebraic degree of cos(2*Pi/n) for constructible n-gons (A003401).

1, 1, 1, 1, 2, 1, 2, 2, 2, 4, 4, 8, 4, 4, 4, 8, 8, 8, 8, 16, 8, 16, 16, 16, 32, 16, 16, 16, 32, 32, 32, 32, 32, 32, 32, 64, 64, 128, 64, 64, 64, 64, 64, 64, 64, 128, 128, 128, 128, 128, 128, 256, 128, 128, 128, 256, 256, 256, 256, 512, 256, 256, 256, 256, 256, 256, 512

Offset

1,5

Links

Table of n, a(n) for n=1..67.

Eric Weisstein's World of Mathematics, Trigonometry Angles

Crossrefs

Cf. A003401, A023022, A113402.

Sequence in context: A226559 A060169 A117958 * A071227 A285442 A108115

Adjacent sequences: A113398 A113399 A113400 * A113402 A113403 A113404

Keyword

nonn,easy,nice

Author

Eric W. Weisstein, Oct 28 2005

Status

approved