cp's OEIS Frontend

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.

A010847 Number of numbers <= n with a prime factor that does not divide n.

Table of values

n a(n)
1 0
2 0
3 1
4 1
5 3
6 1
7 5
8 4
9 6
10 4
11 9
12 4
13 11
14 8
15 10
16 11
17 15
18 8
19 17
20 12
21 16
22 15
23 21
24 13
25 22
26 19
27 23
28 20
29 27
30 12
31 29
32 26
33 27
34 26
35 30
36 22
37 35
38 30
39 33
40 29
41 39
42 23
43 41
44 35
45 37
46 38
47 45
48 33
49 46
50 38
51 45
52 43
53 51
54 38
55 50
56 45
57 51
58 50
59 57
60 34
61 59
62 54
63 55
64 57
65 60
66 44
67 65
68 58
69 63
70 50
71 69
72 54
73 71

List of values

[0, 0, 1, 1, 3, 1, 5, 4, 6, 4, 9, 4, 11, 8, 10, 11, 15, 8, 17, 12, 16, 15, 21, 13, 22, 19, 23, 20, 27, 12, 29, 26, 27, 26, 30, 22, 35, 30, 33, 29, 39, 23, 41, 35, 37, 38, 45, 33, 46, 38, 45, 43, 51, 38, 50, 45, 51, 50, 57, 34, 59, 54, 55, 57, 60, 44, 65, 58, 63, 50, 69, 54, 71]

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

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