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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.

A279847 a(n) = Sum_{k=1..n} k^2*(floor(n/k) - 1).

Table of values

n a(n)
1 0
2 1
3 2
4 7
5 8
6 22
7 23
8 44
9 54
10 84
11 85
12 151
13 152
14 206
15 241
16 326
17 327
18 458
19 459
20 605
21 664
22 790
23 791
24 1065
25 1091
26 1265
27 1356
28 1622
29 1623
30 2023
31 2024
32 2365
33 2496
34 2790
35 2865
36 3480
37 3481
38 3847
39 4026
40 4636
41 4637
42 5373
43 5374
44 6000
45 6341
46 6875
47 6876
48 7982
49 8032
50 8787
51 9086
52 9952
53 9953
54 11137
55 11284

List of values

[0, 1, 2, 7, 8, 22, 23, 44, 54, 84, 85, 151, 152, 206, 241, 326, 327, 458, 459, 605, 664, 790, 791, 1065, 1091, 1265, 1356, 1622, 1623, 2023, 2024, 2365, 2496, 2790, 2865, 3480, 3481, 3847, 4026, 4636, 4637, 5373, 5374, 6000, 6341, 6875, 6876, 7982, 8032, 8787, 9086, 9952, 9953, 11137, 11284]