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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.

A061669 a(n) = n*(mu(n) + 1), where mu(n) is the Moebius function A008683.

Table of values

n a(n)
1 2
2 0
3 0
4 4
5 0
6 12
7 0
8 8
9 9
10 20
11 0
12 12
13 0
14 28
15 30
16 16
17 0
18 18
19 0
20 20
21 42
22 44
23 0
24 24
25 25
26 52
27 27
28 28
29 0
30 0
31 0
32 32
33 66
34 68
35 70
36 36
37 0
38 76
39 78
40 40
41 0
42 0
43 0
44 44
45 45
46 92
47 0
48 48
49 49
50 50
51 102
52 52
53 0
54 54
55 110
56 56
57 114
58 116
59 0
60 60
61 0
62 124
63 63
64 64
65 130
66 0
67 0
68 68
69 138
70 0
71 0
72 72
73 0
74 148
75 75

List of values

[2, 0, 0, 4, 0, 12, 0, 8, 9, 20, 0, 12, 0, 28, 30, 16, 0, 18, 0, 20, 42, 44, 0, 24, 25, 52, 27, 28, 0, 0, 0, 32, 66, 68, 70, 36, 0, 76, 78, 40, 0, 0, 0, 44, 45, 92, 0, 48, 49, 50, 102, 52, 0, 54, 110, 56, 114, 116, 0, 60, 0, 124, 63, 64, 130, 0, 0, 68, 138, 0, 0, 72, 0, 148, 75]

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