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.

A318083 Numbers m such that sigma(sigma(m))/sigma(m) <= sigma(m)/m.

Table of values

n a(n)
1 1
2 2
3 4
4 8
5 9
6 12
7 16
8 18
9 25
10 32
11 36
12 48
13 50
14 52
15 64
16 72
17 80
18 81
19 84
20 90
21 98
22 100
23 108
24 112
25 128
26 144
27 150
28 156
29 162
30 180
31 192
32 196
33 200
34 208
35 225
36 240
37 242
38 244
39 252
40 256
41 288
42 289
43 292
44 300
45 320
46 324
47 336
48 338
49 360
50 372
51 388
52 392
53 400
54 420
55 432
56 441
57 444
58 448
59 450
60 468
61 484

List of values

[1, 2, 4, 8, 9, 12, 16, 18, 25, 32, 36, 48, 50, 52, 64, 72, 80, 81, 84, 90, 98, 100, 108, 112, 128, 144, 150, 156, 162, 180, 192, 196, 200, 208, 225, 240, 242, 244, 252, 256, 288, 289, 292, 300, 320, 324, 336, 338, 360, 372, 388, 392, 400, 420, 432, 441, 444, 448, 450, 468, 484]

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

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