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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.

A231819 Least positive k such that k*n^2 - 1 is a prime, or 0 if no such k exists.

Table of values

n a(n)
1 3
2 1
3 2
4 2
5 6
6 2
7 2
8 2
9 8
10 2
11 2
12 3
13 2
14 3
15 2
16 5
17 2
18 2
19 8
20 5
21 2
22 2
23 8
24 2
25 2
26 3
27 6
28 2
29 12
30 3
31 8
32 5
33 10
34 2
35 6
36 2
37 12
38 2
39 2
40 3
41 2
42 2
43 2
44 3
45 2
46 2
47 18
48 3
49 2
50 2
51 8
52 2
53 20
54 3
55 6
56 2
57 18
58 3
59 2
60 3
61 12
62 2
63 2
64 2
65 6
66 7
67 8
68 6
69 2
70 3
71 14
72 3
73 2
74 3
75 6
76 2
77 6
78 3
79 8
80 2
81 2
82 5
83 6
84 5
85 2

List of values

[3, 1, 2, 2, 6, 2, 2, 2, 8, 2, 2, 3, 2, 3, 2, 5, 2, 2, 8, 5, 2, 2, 8, 2, 2, 3, 6, 2, 12, 3, 8, 5, 10, 2, 6, 2, 12, 2, 2, 3, 2, 2, 2, 3, 2, 2, 18, 3, 2, 2, 8, 2, 20, 3, 6, 2, 18, 3, 2, 3, 12, 2, 2, 2, 6, 7, 8, 6, 2, 3, 14, 3, 2, 3, 6, 2, 6, 3, 8, 2, 2, 5, 6, 5, 2]

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