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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.

A358821 a(n) is the largest square dividing n^2 - 1.

Table of values

n a(n)
2 1
3 4
4 1
5 4
6 1
7 16
8 9
9 16
10 9
11 4
12 1
13 4
14 1
15 16
16 1
17 144
18 1
19 36
20 1
21 4
22 1
23 16
24 25
25 16
26 225
27 4
28 9
29 4
30 1
31 64
32 1
33 64
34 1
35 36
36 1
37 36
38 1
39 16
40 1
41 16
42 1
43 4
44 9
45 4
46 9
47 16
48 49
49 400
50 49
51 100
52 1
53 36
54 1
55 144
56 1
57 16
58 1
59 4
60 1
61 4
62 9
63 64
64 9
65 64
66 1
67 4
68 1
69 4
70 1
71 144
72 1
73 144
74 25
75 4

List of values

[1, 4, 1, 4, 1, 16, 9, 16, 9, 4, 1, 4, 1, 16, 1, 144, 1, 36, 1, 4, 1, 16, 25, 16, 225, 4, 9, 4, 1, 64, 1, 64, 1, 36, 1, 36, 1, 16, 1, 16, 1, 4, 9, 4, 9, 16, 49, 400, 49, 100, 1, 36, 1, 144, 1, 16, 1, 4, 1, 4, 9, 64, 9, 64, 1, 4, 1, 4, 1, 144, 1, 144, 25, 4]

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