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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.

A053229 Numbers n for which second differences of sigma(n) are negative.

Table of values

n a(n)
1 1
2 3
3 5
4 7
5 9
6 11
7 13
8 15
9 17
10 19
11 21
12 23
13 25
14 27
15 29
16 31
17 33
18 35
19 37
20 39
21 41
22 43
23 45
24 47
25 49
26 51
27 53
28 55
29 57
30 59
31 61
32 63
33 65
34 67
35 69
36 71
37 73
38 75
39 77
40 79
41 81
42 83
43 85
44 87
45 89
46 91
47 93
48 95
49 97
50 99
51 101
52 103
53 104
54 105
55 107
56 109
57 111
58 113
59 115
60 117
61 119
62 121
63 123
64 125
65 127
66 129

List of values

[1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 104, 105, 107, 109, 111, 113, 115, 117, 119, 121, 123, 125, 127, 129]

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

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