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.

A117287 Numbers k for which the cototient k-phi(k) is a heptagonal number.

Table of values

n a(n)
1 1
2 2
3 3
4 5
5 7
6 11
7 13
8 15
9 17
10 19
11 23
12 29
13 31
14 34
15 37
16 41
17 43
18 47
19 49
20 53
21 59
22 61
23 67
24 71
25 73
26 79
27 83
28 89
29 97
30 101
31 103
32 107
33 109
34 113
35 127
36 131
37 137
38 139
39 149
40 151
41 157
42 159
43 163
44 167
45 173
46 175
47 179
48 181
49 189
50 191
51 193
52 196
53 197
54 199
55 208
56 211
57 223
58 227
59 229
60 233

List of values

[1, 2, 3, 5, 7, 11, 13, 15, 17, 19, 23, 29, 31, 34, 37, 41, 43, 47, 49, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 159, 163, 167, 173, 175, 179, 181, 189, 191, 193, 196, 197, 199, 208, 211, 223, 227, 229, 233]