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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.

A036013 a(n) = smallest number > 1 such that a(1)a(2)...a(n) - 1 is prime (or 1).

Table of values

n a(n)
1 2
2 2
3 2
4 3
5 2
6 4
7 2
8 3
9 6
10 4
11 5
12 5
13 5
14 10
15 4
16 3
17 5
18 8
19 22
20 13
21 14
22 2
23 5
24 5
25 2
26 20
27 9
28 9
29 24
30 5
31 26
32 15
33 14
34 25
35 25
36 4
37 9
38 30
39 9
40 21
41 12
42 11
43 10
44 2
45 40
46 19
47 8
48 13
49 11
50 50
51 3
52 25
53 25
54 8
55 5
56 25
57 46
58 19
59 47
60 54
61 9
62 13
63 14
64 43
65 4
66 24
67 28
68 16
69 33
70 25
71 152
72 2
73 11
74 22
75 6
76 78
77 87
78 7
79 10
80 21

List of values

[2, 2, 2, 3, 2, 4, 2, 3, 6, 4, 5, 5, 5, 10, 4, 3, 5, 8, 22, 13, 14, 2, 5, 5, 2, 20, 9, 9, 24, 5, 26, 15, 14, 25, 25, 4, 9, 30, 9, 21, 12, 11, 10, 2, 40, 19, 8, 13, 11, 50, 3, 25, 25, 8, 5, 25, 46, 19, 47, 54, 9, 13, 14, 43, 4, 24, 28, 16, 33, 25, 152, 2, 11, 22, 6, 78, 87, 7, 10, 21]

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