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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.

A211449 (p-1)/x, where p = prime(n) and x = ord(4,p), the smallest positive integer such that 4^x == 1 mod p.

Table of values

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

List of values

[0, 2, 2, 2, 2, 2, 4, 2, 2, 2, 6, 2, 4, 6, 2, 2, 2, 2, 2, 2, 8, 2, 2, 8, 4, 2, 2, 2, 6, 8, 18, 2, 4, 2, 2, 10, 6, 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 6, 2, 6, 8, 2, 20, 10, 32, 2, 2, 2, 6, 8, 6, 2, 6, 2, 4, 2, 22, 16, 2, 2, 8, 2, 2, 2, 2, 2, 2, 18, 4, 4, 2, 2, 10, 12]

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