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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.

A368737 a(n) = Sum_{k = 1..n} gcd(3*k, n).

Table of values

n a(n)
1 1
2 3
3 9
4 8
5 9
6 27
7 13
8 20
9 45
10 27
11 21
12 72
13 25
14 39
15 81
16 48
17 33
18 135
19 37
20 72
21 117
22 63
23 45
24 180
25 65
26 75
27 189
28 104
29 57
30 243
31 61
32 112
33 189
34 99
35 117
36 360
37 73
38 111
39 225
40 180
41 81
42 351
43 85
44 168
45 405
46 135
47 93
48 432
49 133
50 195
51 297
52 200
53 105
54 567
55 189
56 260
57 333
58 171
59 117
60 648
61 121
62 183
63 585
64 256
65 225
66 567
67 133
68 264
69 405
70 351

List of values

[1, 3, 9, 8, 9, 27, 13, 20, 45, 27, 21, 72, 25, 39, 81, 48, 33, 135, 37, 72, 117, 63, 45, 180, 65, 75, 189, 104, 57, 243, 61, 112, 189, 99, 117, 360, 73, 111, 225, 180, 81, 351, 85, 168, 405, 135, 93, 432, 133, 195, 297, 200, 105, 567, 189, 260, 333, 171, 117, 648, 121, 183, 585, 256, 225, 567, 133, 264, 405, 351]