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.

A366849 Odd numbers whose halved even prime indices are relatively prime.

Table of values

n a(n)
1 3
2 9
3 15
4 21
5 27
6 33
7 39
8 45
9 51
10 57
11 63
12 69
13 75
14 81
15 87
16 91
17 93
18 99
19 105
20 111
21 117
22 123
23 129
24 135
25 141
26 147
27 153
28 159
29 165
30 171
31 177
32 183
33 189
34 195
35 201
36 203
37 207
38 213
39 219
40 225
41 231
42 237
43 243
44 247
45 249
46 255
47 261
48 267
49 273
50 279
51 285
52 291
53 297
54 301
55 303
56 309

List of values

[3, 9, 15, 21, 27, 33, 39, 45, 51, 57, 63, 69, 75, 81, 87, 91, 93, 99, 105, 111, 117, 123, 129, 135, 141, 147, 153, 159, 165, 171, 177, 183, 189, 195, 201, 203, 207, 213, 219, 225, 231, 237, 243, 247, 249, 255, 261, 267, 273, 279, 285, 291, 297, 301, 303, 309]