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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.

A353636 Difference between phi(sigma(n)) and phi(n).

Table of values

n a(n)
1 0
2 1
3 0
4 4
5 -2
6 2
7 -2
8 4
9 6
10 2
11 -6
12 8
13 -6
14 2
15 0
16 22
17 -10
18 18
19 -10
20 4
21 4
22 2
23 -14
24 8
25 10
26 0
27 -2
28 12
29 -20
30 16
31 -14
32 20
33 -4
34 2
35 -8
36 60
37 -18
38 -2
39 0
40 8
41 -28
42 20
43 -22
44 4
45 0
46 2
47 -30
48 44
49 -6
50 40
51 -8
52 18
53 -34
54 14
55 -16
56 8
57 -4
58 -4
59 -42
60 32
61 -30
62 2
63 12
64 94
65 -24
66 28
67 -34
68 4
69 -12
70 24
71 -46
72 72
73 -36
74 0
75 20
76 12
77 -28
78 24
79 -46
80 28
81 56

List of values

[0, 1, 0, 4, -2, 2, -2, 4, 6, 2, -6, 8, -6, 2, 0, 22, -10, 18, -10, 4, 4, 2, -14, 8, 10, 0, -2, 12, -20, 16, -14, 20, -4, 2, -8, 60, -18, -2, 0, 8, -28, 20, -22, 4, 0, 2, -30, 44, -6, 40, -8, 18, -34, 14, -16, 8, -4, -4, -42, 32, -30, 2, 12, 94, -24, 28, -34, 4, -12, 24, -46, 72, -36, 0, 20, 12, -28, 24, -46, 28, 56]

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