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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.

A087909 a(n) = Sum_{d|n} (n/d)^(d-1).

Table of values

n a(n)
1 1
2 2
3 2
4 4
5 2
6 9
7 2
8 14
9 11
10 23
11 2
12 83
13 2
14 73
15 108
16 202
17 2
18 546
19 2
20 905
21 780
22 1037
23 2
24 5553
25 627
26 4111
27 6644
28 12647
29 2
30 40605
31 2
32 49682
33 59172
34 65555
35 18028
36 382424
37 2
38 262165
39 531612
40 869675
41 2
42 2706581
43 2
44 3147083
45 5180382
46 4194329
47 2
48 27246533
49 117651

List of values

[1, 2, 2, 4, 2, 9, 2, 14, 11, 23, 2, 83, 2, 73, 108, 202, 2, 546, 2, 905, 780, 1037, 2, 5553, 627, 4111, 6644, 12647, 2, 40605, 2, 49682, 59172, 65555, 18028, 382424, 2, 262165, 531612, 869675, 2, 2706581, 2, 3147083, 5180382, 4194329, 2, 27246533, 117651]

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

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