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.

A015834 Numbers k such that phi(k) | sigma(k + 1).

Table of values

n a(n)
1 1
2 2
3 4
4 5
5 6
6 9
7 10
8 13
9 14
10 20
11 21
12 30
13 32
14 34
15 43
16 45
17 54
18 55
19 65
20 68
21 70
22 104
23 109
24 114
25 129
26 132
27 140
28 151
29 153
30 160
31 176
32 183
33 203
34 234
35 245
36 252
37 279
38 314
39 340
40 370
41 407
42 434
43 441
44 539
45 550
46 580
47 589
48 620
49 635
50 644
51 741
52 765
53 798
54 806
55 845
56 860
57 883

List of values

[1, 2, 4, 5, 6, 9, 10, 13, 14, 20, 21, 30, 32, 34, 43, 45, 54, 55, 65, 68, 70, 104, 109, 114, 129, 132, 140, 151, 153, 160, 176, 183, 203, 234, 245, 252, 279, 314, 340, 370, 407, 434, 441, 539, 550, 580, 589, 620, 635, 644, 741, 765, 798, 806, 845, 860, 883]