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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.

A091818 Sum of the even proper divisors of 2n. Sum of the even divisors of 2n that are less than 2n.

Table of values

n a(n)
1 0
2 2
3 2
4 6
5 2
6 12
7 2
8 14
9 8
10 16
11 2
12 32
13 2
14 20
15 18
16 30
17 2
18 42
19 2
20 44
21 22
22 28
23 2
24 72
25 12
26 32
27 26
28 56
29 2
30 84
31 2
32 62
33 30
34 40
35 26
36 110
37 2
38 44
39 34
40 100
41 2
42 108
43 2
44 80
45 66
46 52
47 2
48 152
49 16
50 86
51 42
52 92
53 2
54 132
55 34
56 128
57 46
58 64
59 2
60 216
61 2
62 68
63 82
64 126
65 38
66 156
67 2
68 116

List of values

[0, 2, 2, 6, 2, 12, 2, 14, 8, 16, 2, 32, 2, 20, 18, 30, 2, 42, 2, 44, 22, 28, 2, 72, 12, 32, 26, 56, 2, 84, 2, 62, 30, 40, 26, 110, 2, 44, 34, 100, 2, 108, 2, 80, 66, 52, 2, 152, 16, 86, 42, 92, 2, 132, 34, 128, 46, 64, 2, 216, 2, 68, 82, 126, 38, 156, 2, 116]

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

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