cp's OEIS Frontend

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.

A079667 a(n) = (1/2) * Sum_{d divides n} abs(n/d-d).

Table of values

n a(n)
1 0
2 1
3 2
4 3
5 4
6 6
7 6
8 9
9 8
10 12
11 10
12 16
13 12
14 18
15 16
16 21
17 16
18 27
19 18
20 28
21 24
22 30
23 22
24 40
25 24
26 36
27 32
28 42
29 28
30 50
31 30
32 49
33 40
34 48
35 36
36 65
37 36
38 54
39 48
40 66
41 40
42 72
43 42
44 70
45 60
46 66
47 46
48 92
49 48
50 77
51 64
52 84
53 52
54 96
55 60
56 92
57 72
58 84
59 58
60 126
61 60
62 90
63 82
64 105
65 72
66 120
67 66
68 112
69 88
70 114
71 70

List of values

[0, 1, 2, 3, 4, 6, 6, 9, 8, 12, 10, 16, 12, 18, 16, 21, 16, 27, 18, 28, 24, 30, 22, 40, 24, 36, 32, 42, 28, 50, 30, 49, 40, 48, 36, 65, 36, 54, 48, 66, 40, 72, 42, 70, 60, 66, 46, 92, 48, 77, 64, 84, 52, 96, 60, 92, 72, 84, 58, 126, 60, 90, 82, 105, 72, 120, 66, 112, 88, 114, 70]

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

Content is available under The OEIS End-User License Agreement.