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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.

A384628 a(n) = Sum_{k = 1..n} gcd(n, floor(n / k)).

Table of values

n a(n)
1 1
2 3
3 5
4 8
5 9
6 14
7 13
8 20
9 19
10 25
11 21
12 35
13 25
14 37
15 37
16 44
17 33
18 56
19 37
20 60
21 51
22 58
23 45
24 84
25 53
26 71
27 69
28 85
29 57
30 103
31 61
32 99
33 83
34 93
35 83
36 130
37 73
38 104
39 101
40 136
41 81
42 146
43 85
44 140
45 129
46 124
47 93
48 188
49 103
50 155
51 131
52 163
53 105
54 191
55 127
56 185
57 145
58 159
59 117
60 251
61 121

List of values

[1, 3, 5, 8, 9, 14, 13, 20, 19, 25, 21, 35, 25, 37, 37, 44, 33, 56, 37, 60, 51, 58, 45, 84, 53, 71, 69, 85, 57, 103, 61, 99, 83, 93, 83, 130, 73, 104, 101, 136, 81, 146, 85, 140, 129, 124, 93, 188, 103, 155, 131, 163, 105, 191, 127, 185, 145, 159, 117, 251, 121]