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.

A070999 Numbers n such that the denominator of Sum_{k=1..n} 1/gcd(n,k) is not equal to n.

Table of values

n a(n)
1 6
2 15
3 18
4 21
5 30
6 33
7 35
8 42
9 44
10 45
11 48
12 51
13 54
14 60
15 66
16 69
17 70
18 78
19 84
20 87
21 90
22 99
23 102
24 105
25 114
26 119
27 120
28 123
29 126
30 132
31 133
32 135
33 138
34 140
35 141
36 144
37 147
38 150
39 153
40 159
41 162
42 165
43 168
44 174
45 177
46 180
47 186
48 195
49 198
50 204
51 207
52 210
53 213
54 217
55 220
56 221
57 222

List of values

[6, 15, 18, 21, 30, 33, 35, 42, 44, 45, 48, 51, 54, 60, 66, 69, 70, 78, 84, 87, 90, 99, 102, 105, 114, 119, 120, 123, 126, 132, 133, 135, 138, 140, 141, 144, 147, 150, 153, 159, 162, 165, 168, 174, 177, 180, 186, 195, 198, 204, 207, 210, 213, 217, 220, 221, 222]