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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.

A292786 a(n) = psi(n) - phi(n).

Table of values

n a(n)
1 0
2 2
3 2
4 4
5 2
6 10
7 2
8 8
9 6
10 14
11 2
12 20
13 2
14 18
15 16
16 16
17 2
18 30
19 2
20 28
21 20
22 26
23 2
24 40
25 10
26 30
27 18
28 36
29 2
30 64
31 2
32 32
33 28
34 38
35 24
36 60
37 2
38 42
39 32
40 56
41 2
42 84
43 2
44 52
45 48
46 50
47 2
48 80
49 14
50 70
51 40
52 60
53 2
54 90
55 32
56 72
57 44
58 62
59 2
60 128
61 2
62 66
63 60
64 64
65 36
66 124
67 2
68 76
69 52
70 120
71 2
72 120
73 2
74 78
75 80
76 84
77 36
78 144

List of values

[0, 2, 2, 4, 2, 10, 2, 8, 6, 14, 2, 20, 2, 18, 16, 16, 2, 30, 2, 28, 20, 26, 2, 40, 10, 30, 18, 36, 2, 64, 2, 32, 28, 38, 24, 60, 2, 42, 32, 56, 2, 84, 2, 52, 48, 50, 2, 80, 14, 70, 40, 60, 2, 90, 32, 72, 44, 62, 2, 128, 2, 66, 60, 64, 36, 124, 2, 76, 52, 120, 2, 120, 2, 78, 80, 84, 36, 144]

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