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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.

A166362 a(n) = phi(nonprime(n)).

Table of values

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

List of values

[1, 2, 2, 4, 6, 4, 4, 6, 8, 8, 6, 8, 12, 10, 8, 20, 12, 18, 12, 8, 16, 20, 16, 24, 12, 18, 24, 16, 12, 20, 24, 22, 16, 42, 20, 32, 24, 18, 40, 24, 36, 28, 16, 30, 36, 32, 48, 20, 32, 44, 24, 24, 36, 40, 36, 60, 24, 32, 54, 40, 24, 64, 42, 56, 40, 24, 72, 44, 60, 46, 72, 32, 42, 60]

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

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