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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.

A368673 Number of squarefree numbers less than n that do not divide n.

Table of values

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

List of values

[0, 0, 1, 1, 2, 1, 4, 4, 4, 3, 6, 4, 7, 6, 7, 9, 10, 8, 11, 9, 10, 11, 14, 12, 14, 13, 15, 13, 16, 11, 18, 18, 17, 18, 19, 19, 22, 21, 22, 22, 25, 20, 27, 25, 25, 26, 29, 27, 29, 27, 28, 28, 31, 29, 30, 30, 31, 32, 35, 29, 36, 35, 35, 37, 36, 33, 40, 38, 39, 36, 43]

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

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