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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.

A010848 Number of numbers k <= n such that at least one prime factor of n is not a prime factor of k.

Table of values

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

List of values

[0, 1, 2, 2, 4, 5, 6, 4, 6, 9, 10, 10, 12, 13, 14, 8, 16, 15, 18, 18, 20, 21, 22, 20, 20, 25, 18, 26, 28, 29, 30, 16, 32, 33, 34, 30, 36, 37, 38, 36, 40, 41, 42, 42, 42, 45, 46, 40, 42, 45, 50, 50, 52, 45, 54, 52, 56, 57, 58, 58, 60, 61, 60, 32, 64, 65, 66, 66, 68, 69, 70, 60]

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

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