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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.

A202479 The number of equivalence classes of the set {1,2,...,n} under the equivalence relation x ~ y iff lcm(x,n) = lcm(y,n).

Table of values

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

List of values

[1, 1, 2, 2, 4, 3, 6, 4, 6, 6, 10, 6, 12, 9, 9, 8, 16, 9, 18, 10, 14, 15, 22, 10, 20, 18, 18, 15, 28, 15, 30, 16, 23, 24, 25, 16, 36, 27, 28, 19, 40, 21, 42, 25, 26, 33, 46, 20, 42, 30, 37, 30, 52, 27, 42, 28, 42, 42, 58, 23, 60, 45, 39, 32, 50, 35, 66, 40, 51]

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

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