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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.

A071407 Least k such that k*prime(n) + 1 and k*prime(n) - 1 are twin primes.

Table of values

n a(n)
1 2
2 2
3 6
4 6
5 18
6 24
7 6
8 12
9 6
10 12
11 42
12 54
13 30
14 24
15 6
16 120
17 18
18 258
19 24
20 18
21 84
22 132
23 54
24 48
25 114
26 42
27 6
28 6
29 48
30 24
31 144
32 30
33 6
34 12
35 12
36 78
37 24
38 36
39 30
40 54
41 132
42 18
43 90
44 36
45 66
46 18
47 42
48 30
49 120
50 30
51 36
52 42
53 18
54 18
55 54
56 84
57 60
58 12
59 210
60 12
61 6
62 60
63 150
64 102
65 6
66 210
67 30
68 24
69 6

List of values

[2, 2, 6, 6, 18, 24, 6, 12, 6, 12, 42, 54, 30, 24, 6, 120, 18, 258, 24, 18, 84, 132, 54, 48, 114, 42, 6, 6, 48, 24, 144, 30, 6, 12, 12, 78, 24, 36, 30, 54, 132, 18, 90, 36, 66, 18, 42, 30, 120, 30, 36, 42, 18, 18, 54, 84, 60, 12, 210, 12, 6, 60, 150, 102, 6, 210, 30, 24, 6]

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

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