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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.

A128860 Let p be the n-th odd prime; a(n) is the number of primitive roots of p which are relatively prime to p-1.

Table of values

n a(n)
1 0
2 1
3 1
4 1
5 2
6 4
7 1
8 6
9 5
10 3
11 5
12 6
13 3
14 13
15 11
16 10
17 5
18 5
19 10
20 8
21 9
22 16
23 19
24 11
25 16
26 10
27 22
28 13
29 23
30 12
31 15
32 30
33 9
34 35
35 8
36 17
37 15
38 46
39 41
40 37
41 14
42 34
43 20
44 36
45 16
46 10
47 21
48 49
49 26
50 54
51 43
52 17
53 38
54 64
55 71
56 65
57 23
58 32
59 33
60 22
61 71
62 30
63 56
64 28
65 77
66 16
67 26
68 79
69 38
70 74

List of values

[0, 1, 1, 1, 2, 4, 1, 6, 5, 3, 5, 6, 3, 13, 11, 10, 5, 5, 10, 8, 9, 16, 19, 11, 16, 10, 22, 13, 23, 12, 15, 30, 9, 35, 8, 17, 15, 46, 41, 37, 14, 34, 20, 36, 16, 10, 21, 49, 26, 54, 43, 17, 38, 64, 71, 65, 23, 32, 33, 22, 71, 30, 56, 28, 77, 16, 26, 79, 38, 74]

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

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