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.

A055721 Numbers n such that sigma_2(n)/n > sigma_2(k)/k for all k < n.

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 6
6 8
7 10
8 12
9 14
10 16
11 18
12 20
13 22
14 24
15 28
16 30
17 36
18 40
19 42
20 48
21 54
22 60
23 66
24 70
25 72
26 78
27 80
28 84
29 90
30 96
31 108
32 120
33 132
34 140
35 144
36 150
37 156
38 168
39 180
40 192
41 204
42 210
43 216
44 228
45 240
46 252
47 264
48 270
49 276
50 288
51 300
52 312
53 324
54 330
55 336
56 348
57 360
58 384
59 396
60 408

List of values

[1, 2, 3, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 28, 30, 36, 40, 42, 48, 54, 60, 66, 70, 72, 78, 80, 84, 90, 96, 108, 120, 132, 140, 144, 150, 156, 168, 180, 192, 204, 210, 216, 228, 240, 252, 264, 270, 276, 288, 300, 312, 324, 330, 336, 348, 360, 384, 396, 408]