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.

A259850 Numbers k such that k/phi(k) equals sigma(x)/x for some x<=k.

Table of values

n a(n)
1 1
2 3
3 8
4 9
5 14
6 15
7 16
8 21
9 26
10 27
11 28
12 32
13 40
14 45
15 50
16 52
17 56
18 63
19 64
20 75
21 80
22 81
23 98
24 100
25 104
26 112
27 128
28 130
29 135
30 144
31 147
32 160
33 162
34 182
35 189
36 192
37 196
38 200
39 208
40 216
41 224
42 225
43 243
44 250
45 255
46 256
47 260
48 288
49 310
50 320
51 324
52 338
53 364
54 372
55 375
56 384
57 392
58 400

List of values

[1, 3, 8, 9, 14, 15, 16, 21, 26, 27, 28, 32, 40, 45, 50, 52, 56, 63, 64, 75, 80, 81, 98, 100, 104, 112, 128, 130, 135, 144, 147, 160, 162, 182, 189, 192, 196, 200, 208, 216, 224, 225, 243, 250, 255, 256, 260, 288, 310, 320, 324, 338, 364, 372, 375, 384, 392, 400]