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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.

A051027 a(n) = sigma(sigma(n)) = sum of the divisors of the sum of the divisors of n.

Table of values

n a(n)
1 1
2 4
3 7
4 8
5 12
6 28
7 15
8 24
9 14
10 39
11 28
12 56
13 24
14 60
15 60
16 32
17 39
18 56
19 42
20 96
21 63
22 91
23 60
24 168
25 32
26 96
27 90
28 120
29 72
30 195
31 63
32 104
33 124
34 120
35 124
36 112
37 60
38 168
39 120
40 234
41 96
42 252
43 84
44 224
45 168
46 195
47 124
48 224
49 80
50 128
51 195
52 171
53 120
54 360
55 195
56 360
57 186
58 234
59 168
60 480
61 96

List of values

[1, 4, 7, 8, 12, 28, 15, 24, 14, 39, 28, 56, 24, 60, 60, 32, 39, 56, 42, 96, 63, 91, 60, 168, 32, 96, 90, 120, 72, 195, 63, 104, 124, 120, 124, 112, 60, 168, 120, 234, 96, 252, 84, 224, 168, 195, 124, 224, 80, 128, 195, 171, 120, 360, 195, 360, 186, 234, 168, 480, 96]

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

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