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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.

A138304 Number of prime primitive roots of prime(n).

Table of values

n a(n)
1 0
2 1
3 2
4 2
5 2
6 3
7 4
8 3
9 5
10 4
11 4
12 5
13 6
14 4
15 9
16 6
17 8
18 6
19 7
20 9
21 8
22 8
23 11
24 12
25 11
26 12
27 7
28 12
29 9
30 16
31 11
32 11
33 17
34 9
35 18
36 6
37 11
38 17
39 23
40 18
41 20
42 13
43 20
44 16
45 19
46 13
47 12
48 15
49 24
50 20
51 28
52 24
53 17
54 23
55 28
56 32
57 29
58 15
59 24
60 23
61 13
62 31
63 20
64 32
65 23
66 28
67 15
68 21
69 32
70 22
71 28
72 42
73 27
74 29
75 21
76 43
77 40
78 27

List of values

[0, 1, 2, 2, 2, 3, 4, 3, 5, 4, 4, 5, 6, 4, 9, 6, 8, 6, 7, 9, 8, 8, 11, 12, 11, 12, 7, 12, 9, 16, 11, 11, 17, 9, 18, 6, 11, 17, 23, 18, 20, 13, 20, 16, 19, 13, 12, 15, 24, 20, 28, 24, 17, 23, 28, 32, 29, 15, 24, 23, 13, 31, 20, 32, 23, 28, 15, 21, 32, 22, 28, 42, 27, 29, 21, 43, 40, 27]

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