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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.

A331019 a(n) is the least k such that the denominator(sigma(sigma(k*n))/(k*n)) equals n.

Table of values

n a(n)
1 1
2 15
3 1
4 8
5 1
6 144
7 1
8 16
9 1
10 1
11 1
12 8
13 1
14 255
15 3
16 16
17 1
18 12
19 1
20 2
21 7
22 1
23 1
24 288
25 1
26 18
27 21
28 8
29 1
30 84
31 1
32 13
33 1
34 11
35 1
36 4096
37 1
38 4
39 3
40 270
41 1
42 2448
43 1
44 2
45 3
46 1
47 1
48 16
49 1
50 420
51 3
52 1
53 1
54 124
55 3
56 16
57 3
58 128
59 1
60 616
61 1
62 85
63 3
64 16
65 1
66 1
67 1
68 8
69 3
70 1
71 1
72 32
73 1
74 64

List of values

[1, 15, 1, 8, 1, 144, 1, 16, 1, 1, 1, 8, 1, 255, 3, 16, 1, 12, 1, 2, 7, 1, 1, 288, 1, 18, 21, 8, 1, 84, 1, 13, 1, 11, 1, 4096, 1, 4, 3, 270, 1, 2448, 1, 2, 3, 1, 1, 16, 1, 420, 3, 1, 1, 124, 3, 16, 3, 128, 1, 616, 1, 85, 3, 16, 1, 1, 1, 8, 3, 1, 1, 32, 1, 64]