cp's OEIS Frontend

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.

A289460 Number of units u in Z/nZ such that Phi(3,u) is a unit, where Phi is the cyclotomic polynomial.

Table of values

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

List of values

[1, 1, 1, 2, 4, 1, 4, 4, 3, 4, 10, 2, 10, 4, 4, 8, 16, 3, 16, 8, 4, 10, 22, 4, 20, 10, 9, 8, 28, 4, 28, 16, 10, 16, 16, 6, 34, 16, 10, 16, 40, 4, 40, 20, 12, 22, 46, 8, 28, 20, 16, 20, 52, 9, 40, 16, 16, 28, 58, 8, 58, 28, 12, 32, 40, 10, 64, 32, 22, 16, 70, 12]

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

Content is available under The OEIS End-User License Agreement.