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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.

A283393 a(n) = gcd(n^2-1, n^2+9).

Table of values

n a(n)
0 1
1 10
2 1
3 2
4 5
5 2
6 5
7 2
8 1
9 10
10 1
11 10
12 1
13 2
14 5
15 2
16 5
17 2
18 1
19 10
20 1
21 10
22 1
23 2
24 5
25 2
26 5
27 2
28 1
29 10
30 1
31 10
32 1
33 2
34 5
35 2
36 5
37 2
38 1
39 10
40 1
41 10
42 1
43 2
44 5
45 2
46 5
47 2
48 1
49 10
50 1
51 10
52 1
53 2
54 5
55 2
56 5
57 2
58 1
59 10
60 1
61 10
62 1
63 2
64 5
65 2
66 5
67 2
68 1
69 10
70 1
71 10
72 1
73 2
74 5
75 2
76 5
77 2
78 1
79 10
80 1
81 10
82 1
83 2
84 5
85 2
86 5
87 2
88 1
89 10

List of values

[1, 10, 1, 2, 5, 2, 5, 2, 1, 10, 1, 10, 1, 2, 5, 2, 5, 2, 1, 10, 1, 10, 1, 2, 5, 2, 5, 2, 1, 10, 1, 10, 1, 2, 5, 2, 5, 2, 1, 10, 1, 10, 1, 2, 5, 2, 5, 2, 1, 10, 1, 10, 1, 2, 5, 2, 5, 2, 1, 10, 1, 10, 1, 2, 5, 2, 5, 2, 1, 10, 1, 10, 1, 2, 5, 2, 5, 2, 1, 10, 1, 10, 1, 2, 5, 2, 5, 2, 1, 10]

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