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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.

A066503 a(n) = n - squarefree kernel of n, A007947.

Table of values

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

List of values

[0, 0, 0, 2, 0, 0, 0, 6, 6, 0, 0, 6, 0, 0, 0, 14, 0, 12, 0, 10, 0, 0, 0, 18, 20, 0, 24, 14, 0, 0, 0, 30, 0, 0, 0, 30, 0, 0, 0, 30, 0, 0, 0, 22, 30, 0, 0, 42, 42, 40, 0, 26, 0, 48, 0, 42, 0, 0, 0, 30, 0, 0, 42, 62, 0, 0, 0, 34, 0, 0, 0, 66, 0, 0, 60, 38, 0, 0]

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