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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.

A356655 Clausen numbers based on the strictly proper divisors of n, 1 < d < n.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 3
5 1
6 3
7 1
8 15
9 1
10 3
11 1
12 105
13 1
14 3
15 1
16 15
17 1
18 21
19 1
20 165
21 1
22 3
23 1
24 1365
25 1
26 3
27 1
28 15
29 1
30 231
31 1
32 255
33 1
34 3
35 1
36 25935
37 1
38 3
39 1
40 165
41 1
42 21
43 1
44 345
45 1
46 3
47 1
48 23205
49 1
50 33
51 1
52 15
53 1
54 399
55 1
56 435
57 1
58 3
59 1
60 465465
61 1
62 3
63 1
64 255
65 1
66 483
67 1
68 15
69 1
70 33
71 1

List of values

[1, 1, 1, 1, 3, 1, 3, 1, 15, 1, 3, 1, 105, 1, 3, 1, 15, 1, 21, 1, 165, 1, 3, 1, 1365, 1, 3, 1, 15, 1, 231, 1, 255, 1, 3, 1, 25935, 1, 3, 1, 165, 1, 21, 1, 345, 1, 3, 1, 23205, 1, 33, 1, 15, 1, 399, 1, 435, 1, 3, 1, 465465, 1, 3, 1, 255, 1, 483, 1, 15, 1, 33, 1]