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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.

A054785 a(n) = sigma(2n) - sigma(n), where sigma is the sum of divisors of n, A000203.

Table of values

n a(n)
1 2
2 4
3 8
4 8
5 12
6 16
7 16
8 16
9 26
10 24
11 24
12 32
13 28
14 32
15 48
16 32
17 36
18 52
19 40
20 48
21 64
22 48
23 48
24 64
25 62
26 56
27 80
28 64
29 60
30 96
31 64
32 64
33 96
34 72
35 96
36 104
37 76
38 80
39 112
40 96
41 84
42 128
43 88
44 96
45 156
46 96
47 96
48 128
49 114
50 124
51 144
52 112
53 108
54 160
55 144
56 128
57 160
58 120
59 120
60 192
61 124
62 128
63 208

List of values

[2, 4, 8, 8, 12, 16, 16, 16, 26, 24, 24, 32, 28, 32, 48, 32, 36, 52, 40, 48, 64, 48, 48, 64, 62, 56, 80, 64, 60, 96, 64, 64, 96, 72, 96, 104, 76, 80, 112, 96, 84, 128, 88, 96, 156, 96, 96, 128, 114, 124, 144, 112, 108, 160, 144, 128, 160, 120, 120, 192, 124, 128, 208]

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

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