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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.

A356474 a(n) = phi(rad(prime(n)-1)), where phi = A000010 and rad = A007947.

Table of values

n a(n)
1 1
2 1
3 1
4 2
5 4
6 2
7 1
8 2
9 10
10 6
11 8
12 2
13 4
14 12
15 22
16 12
17 28
18 8
19 20
20 24
21 2
22 24
23 40
24 10
25 2
26 4
27 32
28 52
29 2
30 6
31 12
32 48
33 16
34 44
35 36
36 8
37 24
38 2
39 82
40 42
41 88
42 8
43 72
44 2
45 6
46 20
47 48
48 72
49 112
50 36
51 28
52 96
53 8
54 4
55 1
56 130
57 66
58 8
59 44
60 24
61 92
62 72
63 32
64 120
65 24
66 78
67 80
68 12
69 172
70 56
71 10
72 178
73 120
74 60

List of values

[1, 1, 1, 2, 4, 2, 1, 2, 10, 6, 8, 2, 4, 12, 22, 12, 28, 8, 20, 24, 2, 24, 40, 10, 2, 4, 32, 52, 2, 6, 12, 48, 16, 44, 36, 8, 24, 2, 82, 42, 88, 8, 72, 2, 6, 20, 48, 72, 112, 36, 28, 96, 8, 4, 1, 130, 66, 8, 44, 24, 92, 72, 32, 120, 24, 78, 80, 12, 172, 56, 10, 178, 120, 60]

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