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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.

A304575 a(n) = Sum_{d|n} #{k < d, k squarefree and relatively prime to d}.

Table of values

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

List of values

[1, 2, 3, 4, 4, 6, 6, 8, 7, 8, 8, 12, 9, 12, 12, 15, 12, 16, 13, 17, 16, 18, 16, 24, 17, 20, 20, 23, 18, 26, 20, 28, 23, 26, 24, 33, 24, 29, 28, 35, 27, 35, 29, 37, 34, 35, 31, 46, 32, 38, 35, 41, 33, 45, 36, 47, 38, 42, 37, 54, 38, 46, 46, 54, 42, 53, 42, 54]

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

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