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.

A015709 Composite n such that phi(n) * sigma(n) is one less than a square.

Table of values

n a(n)
1 6
2 22
3 33
4 44
5 69
6 76
7 82
8 140
9 190
10 295
11 354
12 392
13 423
14 451
15 531
16 581
17 650
18 944
19 1072
20 1119
21 1142
22 1150
23 1668
24 2276
25 2893
26 4043
27 4163
28 4176
29 4192
30 4257
31 4262
32 4509
33 5090
34 5975
35 7260
36 8660
37 12977
38 14927
39 15026
40 15753
41 16064
42 19105

List of values

[6, 22, 33, 44, 69, 76, 82, 140, 190, 295, 354, 392, 423, 451, 531, 581, 650, 944, 1072, 1119, 1142, 1150, 1668, 2276, 2893, 4043, 4163, 4176, 4192, 4257, 4262, 4509, 5090, 5975, 7260, 8660, 12977, 14927, 15026, 15753, 16064, 19105]