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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.

A381804 Number of residues r mod n congruent to k such that rad(k) | n but rad(r) does not divide n, with rad = A007947.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
10 1
11 0
12 0
13 0
14 0
15 3
16 0
17 0
18 2
19 0
20 1
21 4
22 6
23 0
24 0
25 0
26 8
27 0
28 1
29 0
30 1
31 0
32 0
33 3
34 3
35 7
36 2
37 0
38 13
39 0
40 1
41 0
42 5
43 0
44 7
45 7
46 6
47 0
48 1
49 0
50 16
51 14
52 8
53 0
54 15
55 3
56 1
57 15
58 23
59 0
60 2
61 0
62 0
63 5
64 0
65 5
66 10
67 0
68 3
69 9
70 15
71 0
72 2
73 0
74 30
75 20
76 14
77 10
78 10
79 0
80 3
81 0
82 14
83 0

List of values

[0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 3, 0, 0, 2, 0, 1, 4, 6, 0, 0, 0, 8, 0, 1, 0, 1, 0, 0, 3, 3, 7, 2, 0, 13, 0, 1, 0, 5, 0, 7, 7, 6, 0, 1, 0, 16, 14, 8, 0, 15, 3, 1, 15, 23, 0, 2, 0, 0, 5, 0, 5, 10, 0, 3, 9, 15, 0, 2, 0, 30, 20, 14, 10, 10, 0, 3, 0, 14, 0]

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