A113401 - OEIS

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A113401

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

1

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

(list; graph; refs; listen; history; text; internal format)

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