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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.

A168080 Numbers n such that exactly two of n+-1, n+-2 and n+-3 are primes.

Table of values

n a(n)
1 0
2 1
3 2
4 3
5 9
6 12
7 15
8 18
9 21
10 22
11 26
12 28
13 30
14 32
15 34
16 38
17 39
18 42
19 45
20 46
21 50
22 56
23 58
24 60
25 62
26 64
27 68
28 69
29 72
30 74
31 76
32 80
33 81
34 82
35 86
36 98
37 99
38 102
39 105
40 108
41 111
42 112
43 128
44 129
45 130
46 134
47 136
48 138
49 140
50 148
51 150
52 152
53 154
54 160
55 164
56 165
57 166
58 170
59 176
60 178
61 180
62 182

List of values

[0, 1, 2, 3, 9, 12, 15, 18, 21, 22, 26, 28, 30, 32, 34, 38, 39, 42, 45, 46, 50, 56, 58, 60, 62, 64, 68, 69, 72, 74, 76, 80, 81, 82, 86, 98, 99, 102, 105, 108, 111, 112, 128, 129, 130, 134, 136, 138, 140, 148, 150, 152, 154, 160, 164, 165, 166, 170, 176, 178, 180, 182]

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

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