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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.

A328456 LCM of the prime indices of 2n + 1, all minus 1; a(0) = 0.

Table of values

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

List of values

[0, 1, 2, 3, 1, 4, 5, 2, 6, 7, 3, 8, 2, 1, 9, 10, 4, 6, 11, 5, 12, 13, 2, 14, 3, 6, 15, 4, 7, 16, 17, 3, 10, 18, 8, 19, 20, 2, 12, 21, 1, 22, 6, 9, 23, 15, 10, 14, 24, 4, 25, 26, 6, 27, 28, 11, 29, 8, 5, 6, 4, 12, 2, 30, 13, 31, 21, 2, 32, 33, 14, 20, 18, 3, 34]

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