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.

A168063 Numbers k such that exactly two of {k-2, k-1, k+1, k+2} are primes.

Table of values

n a(n)
1 1
2 3
3 5
4 6
5 9
6 12
7 15
8 18
9 21
10 30
11 39
12 42
13 45
14 60
15 69
16 72
17 81
18 99
19 102
20 105
21 108
22 111
23 129
24 138
25 150
26 165
27 180
28 192
29 195
30 198
31 225
32 228
33 231
34 240
35 270
36 279
37 282
38 309
39 312
40 315
41 348
42 351
43 381
44 399
45 420
46 432
47 441
48 459
49 462
50 465
51 489
52 501
53 522
54 570
55 600
56 615
57 618

List of values

[1, 3, 5, 6, 9, 12, 15, 18, 21, 30, 39, 42, 45, 60, 69, 72, 81, 99, 102, 105, 108, 111, 129, 138, 150, 165, 180, 192, 195, 198, 225, 228, 231, 240, 270, 279, 282, 309, 312, 315, 348, 351, 381, 399, 420, 432, 441, 459, 462, 465, 489, 501, 522, 570, 600, 615, 618]