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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.

A337030 a(n) is the number of squarefree composite numbers < prime(n).

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 2
6 2
7 4
8 4
9 6
10 7
11 8
12 11
13 13
14 14
15 15
16 16
17 19
18 19
19 22
20 24
21 24
22 27
23 28
24 31
25 35
26 35
27 36
28 38
29 38
30 40
31 46
32 48
33 50
34 51
35 56
36 56
37 58
38 61
39 63
40 64
41 67
42 67
43 73
44 73
45 75
46 75
47 82
48 90
49 91
50 91
51 93
52 96
53 96
54 99
55 102
56 105
57 108
58 108
59 110
60 111
61 112
62 117
63 124
64 126
65 126
66 127

List of values

[0, 0, 0, 1, 2, 2, 4, 4, 6, 7, 8, 11, 13, 14, 15, 16, 19, 19, 22, 24, 24, 27, 28, 31, 35, 35, 36, 38, 38, 40, 46, 48, 50, 51, 56, 56, 58, 61, 63, 64, 67, 67, 73, 73, 75, 75, 82, 90, 91, 91, 93, 96, 96, 99, 102, 105, 108, 108, 110, 111, 112, 117, 124, 126, 126, 127]

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

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