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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.

A078439 a(n) = Sum_{k=1..n} gcd(k,n)*mu(gcd(k,n))^2.

Table of values

n a(n)
1 1
2 3
3 5
4 4
5 9
6 15
7 13
8 8
9 12
10 27
11 21
12 20
13 25
14 39
15 45
16 16
17 33
18 36
19 37
20 36
21 65
22 63
23 45
24 40
25 40
26 75
27 36
28 52
29 57
30 135
31 61
32 32
33 105
34 99
35 117
36 48
37 73
38 111
39 125
40 72
41 81
42 195
43 85
44 84
45 108
46 135
47 93
48 80
49 84
50 120
51 165
52 100
53 105
54 108
55 189
56 104
57 185
58 171
59 117
60 180
61 121
62 183
63 156
64 64

List of values

[1, 3, 5, 4, 9, 15, 13, 8, 12, 27, 21, 20, 25, 39, 45, 16, 33, 36, 37, 36, 65, 63, 45, 40, 40, 75, 36, 52, 57, 135, 61, 32, 105, 99, 117, 48, 73, 111, 125, 72, 81, 195, 85, 84, 108, 135, 93, 80, 84, 120, 165, 100, 105, 108, 189, 104, 185, 171, 117, 180, 121, 183, 156, 64]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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