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.

A086368 Nonsquarefree numbers k such that sigma(k) is squarefree.

Table of values

n a(n)
1 4
2 8
3 9
4 16
5 18
6 20
7 25
8 36
9 45
10 49
11 50
12 64
13 72
14 80
15 100
16 104
17 116
18 117
19 121
20 128
21 144
22 148
23 169
24 180
25 196
26 200
27 208
28 225
29 234
30 242
31 244
32 256
33 261
34 289
35 292
36 296
37 320
38 325
39 333
40 361
41 369
42 404
43 436
44 441
45 450
46 452
47 464
48 488
49 512
50 529
51 548
52 549
53 576
54 578
55 584
56 592

List of values

[4, 8, 9, 16, 18, 20, 25, 36, 45, 49, 50, 64, 72, 80, 100, 104, 116, 117, 121, 128, 144, 148, 169, 180, 196, 200, 208, 225, 234, 242, 244, 256, 261, 289, 292, 296, 320, 325, 333, 361, 369, 404, 436, 441, 450, 452, 464, 488, 512, 529, 548, 549, 576, 578, 584, 592]