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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.

A163108 a(n) = sigma(tau(sigma(n))).

Table of values

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

List of values

[1, 3, 4, 3, 7, 12, 7, 7, 3, 12, 12, 12, 7, 15, 15, 3, 12, 7, 12, 15, 12, 13, 15, 28, 3, 15, 15, 15, 15, 28, 12, 12, 18, 15, 18, 7, 7, 28, 15, 28, 15, 28, 12, 28, 15, 28, 18, 12, 7, 7, 28, 12, 15, 31, 28, 31, 18, 28, 28, 31, 7, 28, 15, 3, 28, 24, 12, 28, 28, 24, 28, 15, 7, 15, 12, 28, 28]

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