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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.

A051612 a(n) = sigma(n) - phi(n).

Table of values

n a(n)
1 0
2 2
3 2
4 5
5 2
6 10
7 2
8 11
9 7
10 14
11 2
12 24
13 2
14 18
15 16
16 23
17 2
18 33
19 2
20 34
21 20
22 26
23 2
24 52
25 11
26 30
27 22
28 44
29 2
30 64
31 2
32 47
33 28
34 38
35 24
36 79
37 2
38 42
39 32
40 74
41 2
42 84
43 2
44 64
45 54
46 50
47 2
48 108
49 15
50 73
51 40
52 74
53 2
54 102
55 32
56 96
57 44
58 62
59 2
60 152
61 2
62 66
63 68
64 95
65 36
66 124
67 2
68 94
69 52
70 120
71 2
72 171
73 2
74 78

List of values

[0, 2, 2, 5, 2, 10, 2, 11, 7, 14, 2, 24, 2, 18, 16, 23, 2, 33, 2, 34, 20, 26, 2, 52, 11, 30, 22, 44, 2, 64, 2, 47, 28, 38, 24, 79, 2, 42, 32, 74, 2, 84, 2, 64, 54, 50, 2, 108, 15, 73, 40, 74, 2, 102, 32, 96, 44, 62, 2, 152, 2, 66, 68, 95, 36, 124, 2, 94, 52, 120, 2, 171, 2, 78]

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