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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.

A051664 a(n) is the number of nonzero coefficients in the n-th cyclotomic polynomial.

Table of values

n a(n)
1 2
2 2
3 3
4 2
5 5
6 3
7 7
8 2
9 3
10 5
11 11
12 3
13 13
14 7
15 7
16 2
17 17
18 3
19 19
20 5
21 9
22 11
23 23
24 3
25 5
26 13
27 3
28 7
29 29
30 7
31 31
32 2
33 15
34 17
35 17
36 3
37 37
38 19
39 17
40 5
41 41
42 9
43 43
44 11
45 7
46 23
47 47
48 3
49 7
50 5
51 23
52 13
53 53
54 3
55 17
56 7
57 25
58 29
59 59
60 7
61 61
62 31
63 9
64 2
65 31
66 15
67 67
68 17
69 31
70 17
71 71
72 3
73 73
74 37
75 7
76 19
77 31
78 17
79 79
80 5
81 3

List of values

[2, 2, 3, 2, 5, 3, 7, 2, 3, 5, 11, 3, 13, 7, 7, 2, 17, 3, 19, 5, 9, 11, 23, 3, 5, 13, 3, 7, 29, 7, 31, 2, 15, 17, 17, 3, 37, 19, 17, 5, 41, 9, 43, 11, 7, 23, 47, 3, 7, 5, 23, 13, 53, 3, 17, 7, 25, 29, 59, 7, 61, 31, 9, 2, 31, 15, 67, 17, 31, 17, 71, 3, 73, 37, 7, 19, 31, 17, 79, 5, 3]

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

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