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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 2
6 1
7 2
8 2
9 2
10 4
11 4
12 8
13 4
14 4
15 4
16 8
17 8
18 8
19 8
20 16
21 8
22 16
23 16
24 16
25 32
26 16
27 16
28 16
29 32
30 32
31 32
32 32
33 32
34 32
35 32
36 64
37 64
38 128
39 64
40 64
41 64
42 64
43 64
44 64
45 64
46 128
47 128
48 128
49 128
50 128
51 128
52 256
53 128
54 128
55 128
56 256
57 256
58 256
59 256
60 512
61 256
62 256
63 256
64 256
65 256
66 256
67 512

List of values

[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]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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