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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.

A290309 Number of units u in Z/nZ such that Phi(5,u) is a unit, where Phi is the cyclotomic polynomial.

Table of values

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

List of values

[1, 1, 2, 2, 3, 2, 6, 4, 6, 3, 6, 4, 12, 6, 6, 8, 16, 6, 18, 6, 12, 6, 22, 8, 15, 12, 18, 12, 28, 6, 26, 16, 12, 16, 18, 12, 36, 18, 24, 12, 36, 12, 42, 12, 18, 22, 46, 16, 42, 15, 32, 24, 52, 18, 18, 24, 36, 28, 58, 12, 56, 26, 36, 32, 36, 12, 66, 32, 44, 18]

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

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