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.

A117286 Numbers k for which the cototient k-phi(k) is a hexagonal number.

Table of values

n a(n)
1 1
2 2
3 3
4 5
5 7
6 10
7 11
8 13
9 17
10 19
11 23
12 29
13 31
14 37
15 39
16 41
17 43
18 47
19 52
20 53
21 55
22 59
23 61
24 67
25 71
26 73
27 79
28 83
29 89
30 90
31 97
32 101
33 103
34 107
35 109
36 113
37 117
38 127
39 129
40 131
41 137
42 139
43 149
44 151
45 157
46 163
47 167
48 168
49 173
50 179
51 181
52 191
53 193
54 197
55 199
56 200
57 205
58 211
59 223
60 227
61 229

List of values

[1, 2, 3, 5, 7, 10, 11, 13, 17, 19, 23, 29, 31, 37, 39, 41, 43, 47, 52, 53, 55, 59, 61, 67, 71, 73, 79, 83, 89, 90, 97, 101, 103, 107, 109, 113, 117, 127, 129, 131, 137, 139, 149, 151, 157, 163, 167, 168, 173, 179, 181, 191, 193, 197, 199, 200, 205, 211, 223, 227, 229]

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

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