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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.

A356043 a(n) = Sum_{k=1..n} sigma_3(k) * floor(n/k).

Table of values

n a(n)
1 1
2 11
3 40
4 123
5 250
6 540
7 885
8 1553
9 2339
10 3609
11 4942
12 7349
13 9548
14 12998
15 16681
16 22030
17 26945
18 34805
19 41666
20 52207
21 62212
22 75542
23 87711
24 107083
25 122961
26 144951
27 166177
28 194812
29 219203
30 256033
31 285826
32 328624
33 367281
34 416431
35 460246
36 525484
37 576139
38 644749
39 708520

List of values

[1, 11, 40, 123, 250, 540, 885, 1553, 2339, 3609, 4942, 7349, 9548, 12998, 16681, 22030, 26945, 34805, 41666, 52207, 62212, 75542, 87711, 107083, 122961, 144951, 166177, 194812, 219203, 256033, 285826, 328624, 367281, 416431, 460246, 525484, 576139, 644749, 708520]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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