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.

A070286 Numbers k such that the equation sigma(sigma(x)) = k has solutions.

Table of values

n a(n)
1 1
2 4
3 7
4 8
5 12
6 14
7 15
8 24
9 28
10 32
11 39
12 42
13 56
14 60
15 63
16 72
17 80
18 84
19 90
20 91
21 96
22 104
23 112
24 114
25 120
26 124
27 126
28 128
29 133
30 160
31 168
32 171
33 186
34 195
35 210
36 216
37 224
38 234
39 240
40 248
41 252
42 255
43 256
44 260
45 280
46 288
47 294
48 300
49 308
50 312
51 336
52 360
53 363
54 372
55 378
56 384
57 392

List of values

[1, 4, 7, 8, 12, 14, 15, 24, 28, 32, 39, 42, 56, 60, 63, 72, 80, 84, 90, 91, 96, 104, 112, 114, 120, 124, 126, 128, 133, 160, 168, 171, 186, 195, 210, 216, 224, 234, 240, 248, 252, 255, 256, 260, 280, 288, 294, 300, 308, 312, 336, 360, 363, 372, 378, 384, 392]