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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.

A225520 The number of subsets of the set of divisors of n in which elements are pairwise coprime.

Table of values

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

List of values

[2, 4, 4, 6, 4, 10, 4, 8, 6, 10, 4, 16, 4, 10, 10, 10, 4, 16, 4, 16, 10, 10, 4, 22, 6, 10, 8, 16, 4, 30, 4, 12, 10, 10, 10, 26, 4, 10, 10, 22, 4, 30, 4, 16, 16, 10, 4, 28, 6, 16, 10, 16, 4, 22, 10, 22, 10, 10, 4, 50, 4, 10, 16, 14, 10, 30, 4, 16, 10, 30, 4, 36]

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

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