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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.

A339665 Number of nonempty subsets of divisors of n whose harmonic mean is an integer.

Table of values

n a(n)
1 1
2 2
3 2
4 3
5 2
6 9
7 2
8 4
9 3
10 4
11 2
12 17
13 2
14 4
15 6
16 5
17 2
18 19
19 2
20 10
21 4
22 4
23 2
24 37
25 3
26 4
27 4
28 12
29 2
30 45
31 2
32 6
33 4
34 4
35 4
36 57
37 2
38 4
39 4
40 28
41 2
42 29
43 2
44 6
45 16
46 4
47 2
48 85
49 3
50 6
51 4
52 6
53 2
54 35
55 4
56 23
57 4
58 4
59 2
60 301
61 2
62 4
63 6
64 7
65 4
66 28
67 2
68 6
69 4
70 19
71 2
72 255
73 2
74 4
75 10
76 6
77 4
78 20
79 2
80 61

List of values

[1, 2, 2, 3, 2, 9, 2, 4, 3, 4, 2, 17, 2, 4, 6, 5, 2, 19, 2, 10, 4, 4, 2, 37, 3, 4, 4, 12, 2, 45, 2, 6, 4, 4, 4, 57, 2, 4, 4, 28, 2, 29, 2, 6, 16, 4, 2, 85, 3, 6, 4, 6, 2, 35, 4, 23, 4, 4, 2, 301, 2, 4, 6, 7, 4, 28, 2, 6, 4, 19, 2, 255, 2, 4, 10, 6, 4, 20, 2, 61]

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