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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.

A381800 a(n) = number of distinct residues r mod n of numbers k such that rad(k) | n, where rad = A007947.

Table of values

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

List of values

[1, 2, 2, 3, 2, 5, 2, 4, 3, 7, 2, 8, 2, 6, 8, 5, 2, 12, 2, 9, 9, 13, 2, 11, 3, 15, 4, 9, 2, 19, 2, 6, 9, 11, 12, 16, 2, 21, 6, 12, 2, 24, 2, 16, 15, 14, 2, 16, 3, 28, 20, 17, 2, 31, 8, 12, 21, 31, 2, 28, 2, 8, 13, 7, 10, 32, 2, 13, 15, 35, 2, 20, 2, 39, 29, 24]

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