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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.

A231233 Triangle T(n,k) = greatest prime factor of n*k+1.

Table of values

n a(n)
1 2
2 3
3 5
4 2
5 7
6 5
7 5
8 3
9 13
10 17
11 3
12 11
13 2
14 7
15 13
16 7
17 13
18 19
19 5
20 31
21 37
22 2
23 5
24 11
25 29
26 3
27 43
28 5
29 3
30 17
31 5
32 11
33 41
34 7
35 19
36 13
37 5
38 19
39 7
40 37
41 23
42 11
43 2
44 73
45 41
46 11
47 7
48 31
49 41
50 17
51 61
52 71
53 3
54 13
55 101
56 3
57 23
58 17
59 5
60 7
61 67
62 13
63 89
64 5
65 37
66 61
67 13
68 5
69 37
70 7
71 61
72 73
73 17
74 97
75 109
76 11
77 19
78 29

List of values

[2, 3, 5, 2, 7, 5, 5, 3, 13, 17, 3, 11, 2, 7, 13, 7, 13, 19, 5, 31, 37, 2, 5, 11, 29, 3, 43, 5, 3, 17, 5, 11, 41, 7, 19, 13, 5, 19, 7, 37, 23, 11, 2, 73, 41, 11, 7, 31, 41, 17, 61, 71, 3, 13, 101, 3, 23, 17, 5, 7, 67, 13, 89, 5, 37, 61, 13, 5, 37, 7, 61, 73, 17, 97, 109, 11, 19, 29]

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