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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.

A103688 a(n) = n if A103689(n)*n +/- 1 are twin primes; a(n) = 0 otherwise.

Table of values

n a(n)
1 0
2 0
3 0
4 4
5 0
6 6
7 0
8 0
9 9
10 0
11 0
12 12
13 0
14 0
15 15
16 0
17 0
18 18
19 0
20 0
21 21
22 0
23 0
24 0
25 0
26 0
27 0
28 0
29 0
30 30
31 0
32 0
33 0
34 0
35 0
36 0
37 0
38 0
39 0
40 0
41 0
42 42
43 0
44 0
45 0
46 0
47 47
48 0
49 0
50 0
51 51
52 0
53 0
54 0
55 0
56 0
57 0
58 0
59 0
60 60
61 0
62 0
63 0
64 0
65 0
66 0
67 0
68 0
69 69
70 0
71 0
72 72
73 0
74 0
75 75
76 0
77 0
78 0
79 0
80 0
81 0
82 0

List of values

[0, 0, 0, 4, 0, 6, 0, 0, 9, 0, 0, 12, 0, 0, 15, 0, 0, 18, 0, 0, 21, 0, 0, 0, 0, 0, 0, 0, 0, 30, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 42, 0, 0, 0, 0, 47, 0, 0, 0, 51, 0, 0, 0, 0, 0, 0, 0, 0, 60, 0, 0, 0, 0, 0, 0, 0, 0, 69, 0, 0, 72, 0, 0, 75, 0, 0, 0, 0, 0, 0, 0]

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