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.

A067382 Numbers n such that sigma(phi(n))/sigma(n) = 2.

Table of values

n a(n)
1 13
2 71
3 89
4 203
5 305
6 319
7 667
8 1363
9 1421
10 1525
11 1711
12 1889
13 2407
14 2933
15 3103
16 4609
17 4615
18 4843
19 5191
20 6583
21 7123
22 7625
23 7627
24 9947
25 10063
26 10411
27 11107
28 13543
29 13891
30 14587
31 16327
32 17023
33 19693
34 20851
35 23075
36 24331
37 24721
38 25027
39 25723

List of values

[13, 71, 89, 203, 305, 319, 667, 1363, 1421, 1525, 1711, 1889, 2407, 2933, 3103, 4609, 4615, 4843, 5191, 6583, 7123, 7625, 7627, 9947, 10063, 10411, 11107, 13543, 13891, 14587, 16327, 17023, 19693, 20851, 23075, 24331, 24721, 25027, 25723]