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.

A053228 n for which second differences of sigma(n) are positive.

Table of values

n a(n)
1 2
2 4
3 6
4 8
5 10
6 12
7 14
8 16
9 18
10 20
11 22
12 24
13 26
14 28
15 30
16 32
17 34
18 36
19 38
20 40
21 42
22 46
23 48
24 50
25 52
26 54
27 56
28 58
29 60
30 62
31 64
32 66
33 68
34 70
35 72
36 74
37 76
38 78
39 80
40 82
41 84
42 86
43 88
44 90
45 92
46 94
47 96
48 98
49 100
50 102
51 106
52 108
53 110
54 112
55 114
56 116
57 118
58 120
59 122
60 124
61 126
62 128
63 130
64 132

List of values

[2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128, 130, 132]

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

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