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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.

A368739 a(n) = Sum_{k = 1..n} gcd(4*k, n).

Table of values

n a(n)
1 1
2 4
3 5
4 16
5 9
6 20
7 13
8 48
9 21
10 36
11 21
12 80
13 25
14 52
15 45
16 128
17 33
18 84
19 37
20 144
21 65
22 84
23 45
24 240
25 65
26 100
27 81
28 208
29 57
30 180
31 61
32 320
33 105
34 132
35 117
36 336
37 73
38 148
39 125
40 432
41 81
42 260
43 85
44 336
45 189
46 180
47 93
48 640
49 133
50 260
51 165
52 400
53 105
54 324
55 189
56 624
57 185
58 228
59 117
60 720
61 121
62 244
63 273
64 768

List of values

[1, 4, 5, 16, 9, 20, 13, 48, 21, 36, 21, 80, 25, 52, 45, 128, 33, 84, 37, 144, 65, 84, 45, 240, 65, 100, 81, 208, 57, 180, 61, 320, 105, 132, 117, 336, 73, 148, 125, 432, 81, 260, 85, 336, 189, 180, 93, 640, 133, 260, 165, 400, 105, 324, 189, 624, 185, 228, 117, 720, 121, 244, 273, 768]

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

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