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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.

A235863 Exponent of the multiplicative group G_n:={x+iy: x^2+y^2==1 (mod n); 0 <= x,y < n} where i=sqrt(-1).

Table of values

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

List of values

[1, 2, 4, 4, 4, 4, 8, 4, 12, 4, 12, 4, 12, 8, 4, 4, 16, 12, 20, 4, 8, 12, 24, 4, 20, 12, 36, 8, 28, 4, 32, 8, 12, 16, 8, 12, 36, 20, 12, 4, 40, 8, 44, 12, 12, 24, 48, 4, 56, 20, 16, 12, 52, 36, 12, 8, 20, 28, 60, 4, 60, 32, 24, 16, 12, 12, 68, 16, 24, 8, 72]