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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.

A051709 a(n) = sigma(n) + phi(n) - 2n.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 0
6 2
7 0
8 3
9 1
10 2
11 0
12 8
13 0
14 2
15 2
16 7
17 0
18 9
19 0
20 10
21 2
22 2
23 0
24 20
25 1
26 2
27 4
28 12
29 0
30 20
31 0
32 15
33 2
34 2
35 2
36 31
37 0
38 2
39 2
40 26
41 0
42 24
43 0
44 16
45 12
46 2
47 0
48 44
49 1
50 13
51 2
52 18
53 0
54 30
55 2
56 32
57 2
58 2
59 0
60 64
61 0
62 2
63 14
64 31
65 2
66 32
67 0
68 22
69 2
70 28
71 0
72 75
73 0
74 2
75 14
76 24
77 2
78 36
79 0

List of values

[0, 0, 0, 1, 0, 2, 0, 3, 1, 2, 0, 8, 0, 2, 2, 7, 0, 9, 0, 10, 2, 2, 0, 20, 1, 2, 4, 12, 0, 20, 0, 15, 2, 2, 2, 31, 0, 2, 2, 26, 0, 24, 0, 16, 12, 2, 0, 44, 1, 13, 2, 18, 0, 30, 2, 32, 2, 2, 0, 64, 0, 2, 14, 31, 2, 32, 0, 22, 2, 28, 0, 75, 0, 2, 14, 24, 2, 36, 0]

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