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.

A062514 Numbers k such that sigma(phi(k)) is a prime.

Table of values

n a(n)
1 3
2 4
3 5
4 6
5 8
6 10
7 12
8 17
9 32
10 34
11 40
12 48
13 60
14 85
15 128
16 136
17 160
18 170
19 192
20 204
21 240
22 4369
23 8192
24 8224
25 8704
26 8738
27 10240
28 10280
29 10880
30 12288
31 12336
32 13056
33 15360
34 15420
35 16320
36 65537
37 131072
38 131074
39 131584
40 139264
41 139808
42 163840
43 164480
44 174080

List of values

[3, 4, 5, 6, 8, 10, 12, 17, 32, 34, 40, 48, 60, 85, 128, 136, 160, 170, 192, 204, 240, 4369, 8192, 8224, 8704, 8738, 10240, 10280, 10880, 12288, 12336, 13056, 15360, 15420, 16320, 65537, 131072, 131074, 131584, 139264, 139808, 163840, 164480, 174080]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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