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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.

A344372 a(n) = Sum_{k = 1..n} gcd(2*k, n).

Table of values

n a(n)
1 1
2 4
3 5
4 12
5 9
6 20
7 13
8 32
9 21
10 36
11 21
12 60
13 25
14 52
15 45
16 80
17 33
18 84
19 37
20 108
21 65
22 84
23 45
24 160
25 65
26 100
27 81
28 156
29 57
30 180
31 61
32 192
33 105
34 132
35 117
36 252
37 73
38 148
39 125
40 288
41 81
42 260
43 85
44 252
45 189
46 180
47 93
48 400
49 133
50 260
51 165
52 300
53 105
54 324
55 189
56 416
57 185
58 228
59 117
60 540
61 121
62 244
63 273

List of values

[1, 4, 5, 12, 9, 20, 13, 32, 21, 36, 21, 60, 25, 52, 45, 80, 33, 84, 37, 108, 65, 84, 45, 160, 65, 100, 81, 156, 57, 180, 61, 192, 105, 132, 117, 252, 73, 148, 125, 288, 81, 260, 85, 252, 189, 180, 93, 400, 133, 260, 165, 300, 105, 324, 189, 416, 185, 228, 117, 540, 121, 244, 273]

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

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