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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.

A059909 a(n) = |{m : multiplicative order of n mod m = 4}|.

Table of values

n a(n)
1 0
2 2
3 6
4 4
5 12
6 4
7 26
8 18
9 14
10 6
11 24
12 12
13 64
14 8
15 16
16 8
17 66
18 20
19 36
20 8
21 64
22 24
23 76
24 6
25 28
26 12
27 64
28 24
29 48
30 12
31 100
32 40
33 50
34 48
35 36
36 8
37 96
38 40
39 28
40 8
41 104
42 12
43 208
44 36
45 24
46 36
47 200
48 18
49 48
50 36
51 36
52 24
53 128
54 8
55 152
56 16
57 172
58 24
59 48
60 12
61 48
62 36
63 56
64 72
65 40
66 8
67 128
68 56
69 48
70 40

List of values

[0, 2, 6, 4, 12, 4, 26, 18, 14, 6, 24, 12, 64, 8, 16, 8, 66, 20, 36, 8, 64, 24, 76, 6, 28, 12, 64, 24, 48, 12, 100, 40, 50, 48, 36, 8, 96, 40, 28, 8, 104, 12, 208, 36, 24, 36, 200, 18, 48, 36, 36, 24, 128, 8, 152, 16, 172, 24, 48, 12, 48, 36, 56, 72, 40, 8, 128, 56, 48, 40]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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