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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.

A127573 Triangle T(n, k) = k*sigma(k) if k divides n, else 0.

Table of values

n a(n)
1 1
2 1
3 6
4 1
5 0
6 12
7 1
8 6
9 0
10 28
11 1
12 0
13 0
14 0
15 30
16 1
17 6
18 12
19 0
20 0
21 72
22 1
23 0
24 0
25 0
26 0
27 0
28 56
29 1
30 6
31 0
32 28
33 0
34 0
35 0
36 120
37 1
38 0
39 12
40 0
41 0
42 0
43 0
44 0
45 117
46 1
47 6
48 0
49 0
50 30
51 0
52 0
53 0
54 0
55 180
56 1
57 0
58 0
59 0
60 0
61 0
62 0
63 0
64 0
65 0
66 132
67 1
68 6
69 12
70 28
71 0
72 72
73 0
74 0
75 0
76 0
77 0
78 336

List of values

[1, 1, 6, 1, 0, 12, 1, 6, 0, 28, 1, 0, 0, 0, 30, 1, 6, 12, 0, 0, 72, 1, 0, 0, 0, 0, 0, 56, 1, 6, 0, 28, 0, 0, 0, 120, 1, 0, 12, 0, 0, 0, 0, 0, 117, 1, 6, 0, 0, 30, 0, 0, 0, 0, 180, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 1, 6, 12, 28, 0, 72, 0, 0, 0, 0, 0, 336]

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