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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.

A169643 Numbers k such that neither composite(k)+-1 is composite.

Table of values

n a(n)
1 1
2 2
3 6
4 10
5 19
6 28
7 42
8 51
9 75
10 79
11 104
12 114
13 138
14 148
15 152
16 178
17 187
18 212
19 221
20 247
21 278
22 338
23 348
24 372
25 423
26 465
27 490
28 504
29 525
30 539
31 669
32 679
33 683
34 709
35 729
36 848
37 858
38 873
39 883
40 909
41 961
42 1028
43 1071
44 1080
45 1089
46 1104
47 1202
48 1221
49 1247
50 1251
51 1354
52 1363

List of values

[1, 2, 6, 10, 19, 28, 42, 51, 75, 79, 104, 114, 138, 148, 152, 178, 187, 212, 221, 247, 278, 338, 348, 372, 423, 465, 490, 504, 525, 539, 669, 679, 683, 709, 729, 848, 858, 873, 883, 909, 961, 1028, 1071, 1080, 1089, 1104, 1202, 1221, 1247, 1251, 1354, 1363]

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

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