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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.

A076480 a(n) = n + mu(rad(n)), where mu is the Moebius function (A008683) and rad is the squarefree kernel (A007947).

Table of values

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

List of values

[2, 1, 2, 3, 4, 7, 6, 7, 8, 11, 10, 13, 12, 15, 16, 15, 16, 19, 18, 21, 22, 23, 22, 25, 24, 27, 26, 29, 28, 29, 30, 31, 34, 35, 36, 37, 36, 39, 40, 41, 40, 41, 42, 45, 46, 47, 46, 49, 48, 51, 52, 53, 52, 55, 56, 57, 58, 59, 58, 59, 60, 63, 64, 63, 66, 65, 66, 69, 70, 69, 70, 73]

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