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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.

A063994 a(n) = Product_{primes p dividing n } gcd(p-1, n-1).

Table of values

n a(n)
1 1
2 1
3 2
4 1
5 4
6 1
7 6
8 1
9 2
10 1
11 10
12 1
13 12
14 1
15 4
16 1
17 16
18 1
19 18
20 1
21 4
22 1
23 22
24 1
25 4
26 1
27 2
28 3
29 28
30 1
31 30
32 1
33 4
34 1
35 4
36 1
37 36
38 1
39 4
40 1
41 40
42 1
43 42
44 1
45 8
46 1
47 46
48 1
49 6
50 1
51 4
52 3
53 52
54 1
55 4
56 1
57 4
58 1
59 58
60 1
61 60
62 1
63 4
64 1
65 16
66 5
67 66
68 1
69 4
70 3
71 70
72 1
73 72
74 1
75 4
76 3
77 4
78 1
79 78
80 1
81 2
82 1
83 82
84 1
85 16
86 1
87 4
88 1
89 88
90 1
91 36
92 1

List of values

[1, 1, 2, 1, 4, 1, 6, 1, 2, 1, 10, 1, 12, 1, 4, 1, 16, 1, 18, 1, 4, 1, 22, 1, 4, 1, 2, 3, 28, 1, 30, 1, 4, 1, 4, 1, 36, 1, 4, 1, 40, 1, 42, 1, 8, 1, 46, 1, 6, 1, 4, 3, 52, 1, 4, 1, 4, 1, 58, 1, 60, 1, 4, 1, 16, 5, 66, 1, 4, 3, 70, 1, 72, 1, 4, 3, 4, 1, 78, 1, 2, 1, 82, 1, 16, 1, 4, 1, 88, 1, 36, 1]