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.

A071388 Numbers k such that the cardinality of the set of solutions to phi(x) = k is a prime.

Table of values

n a(n)
1 1
2 2
3 8
4 10
5 20
6 22
7 28
8 30
9 32
10 44
11 46
12 48
13 52
14 54
15 56
16 58
17 66
18 70
19 72
20 78
21 82
22 92
23 96
24 102
25 104
26 106
27 110
28 116
29 120
30 126
31 130
32 132
33 136
34 138
35 140
36 148
37 150
38 156
39 164
40 166
41 172
42 178
43 190
44 196
45 198
46 204
47 210
48 212
49 216
50 220
51 222
52 226
53 228
54 238
55 240
56 250
57 260
58 262

List of values

[1, 2, 8, 10, 20, 22, 28, 30, 32, 44, 46, 48, 52, 54, 56, 58, 66, 70, 72, 78, 82, 92, 96, 102, 104, 106, 110, 116, 120, 126, 130, 132, 136, 138, 140, 148, 150, 156, 164, 166, 172, 178, 190, 196, 198, 204, 210, 212, 216, 220, 222, 226, 228, 238, 240, 250, 260, 262]

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

Content is available under The OEIS End-User License Agreement.