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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.

A351520 Number of numbers <= n that are either squarefree, a divisor of n, or both.

Table of values

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

List of values

[1, 2, 3, 4, 4, 5, 6, 8, 7, 7, 8, 10, 9, 10, 11, 14, 12, 14, 13, 15, 14, 15, 16, 20, 17, 17, 19, 19, 18, 19, 20, 24, 21, 22, 23, 28, 24, 25, 26, 30, 27, 28, 29, 31, 31, 30, 31, 37, 32, 33, 32, 34, 33, 37, 34, 38, 35, 36, 37, 41, 38, 39, 41, 44, 40, 41, 42, 44, 43, 44, 45, 53, 46, 47, 49]

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

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