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.

A173136 Odd nonprimes n such that exactly one of 2n-1 and 2n+1 is prime.

Table of values

n a(n)
1 1
2 27
3 33
4 35
5 39
6 45
7 49
8 55
9 57
10 63
11 65
12 81
13 87
14 91
15 95
16 105
17 111
18 115
19 117
20 119
21 121
22 125
23 129
24 147
25 153
26 155
27 159
28 165
29 169
30 175
31 177
32 183
33 187
34 189
35 195
36 201
37 205
38 209
39 215
40 217
41 219
42 221
43 225
44 243
45 245
46 249
47 255
48 273
49 279
50 289
51 297
52 299
53 301
54 303
55 315

List of values

[1, 27, 33, 35, 39, 45, 49, 55, 57, 63, 65, 81, 87, 91, 95, 105, 111, 115, 117, 119, 121, 125, 129, 147, 153, 155, 159, 165, 169, 175, 177, 183, 187, 189, 195, 201, 205, 209, 215, 217, 219, 221, 225, 243, 245, 249, 255, 273, 279, 289, 297, 299, 301, 303, 315]