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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.

A084887 Triangular array, read by rows: T(n,k) = denominator of arithmetic derivative of k/n, 1<=k<=n.

Table of values

n a(n)
1 1
2 4
3 1
4 9
5 9
6 1
7 4
8 4
9 2
10 1
11 25
12 25
13 25
14 25
15 1
16 36
17 9
18 4
19 9
20 36
21 1
22 49
23 49
24 49
25 49
26 49
27 49
28 1
29 16
30 4
31 16
32 4
33 16
34 2
35 16
36 1
37 27
38 27
39 9
40 27
41 27
42 9
43 27
44 27
45 1
46 100
47 25
48 100
49 25
50 4
51 25
52 100
53 25
54 100
55 1
56 121
57 121
58 121
59 121
60 121
61 121
62 121
63 121
64 121
65 121
66 1
67 9
68 36
69 4
70 9
71 36
72 4
73 36

List of values

[1, 4, 1, 9, 9, 1, 4, 4, 2, 1, 25, 25, 25, 25, 1, 36, 9, 4, 9, 36, 1, 49, 49, 49, 49, 49, 49, 1, 16, 4, 16, 4, 16, 2, 16, 1, 27, 27, 9, 27, 27, 9, 27, 27, 1, 100, 25, 100, 25, 4, 25, 100, 25, 100, 1, 121, 121, 121, 121, 121, 121, 121, 121, 121, 121, 1, 9, 36, 4, 9, 36, 4, 36]

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