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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.

A072281 Numbers n such that phi(n) + 1 and phi(n) - 1 are twin primes.

Table of values

n a(n)
1 5
2 7
3 8
4 9
5 10
6 12
7 13
8 14
9 18
10 19
11 21
12 26
13 27
14 28
15 31
16 36
17 38
18 42
19 43
20 49
21 54
22 61
23 62
24 73
25 77
26 86
27 91
28 93
29 95
30 98
31 99
32 103
33 109
34 111
35 117
36 122
37 124
38 133
39 135
40 139
41 146
42 148
43 151
44 152
45 154
46 171
47 181
48 182
49 186
50 189
51 190
52 193
53 198
54 199
55 206
56 209
57 216
58 217
59 218
60 221
61 222

List of values

[5, 7, 8, 9, 10, 12, 13, 14, 18, 19, 21, 26, 27, 28, 31, 36, 38, 42, 43, 49, 54, 61, 62, 73, 77, 86, 91, 93, 95, 98, 99, 103, 109, 111, 117, 122, 124, 133, 135, 139, 146, 148, 151, 152, 154, 171, 181, 182, 186, 189, 190, 193, 198, 199, 206, 209, 216, 217, 218, 221, 222]

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

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