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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.

A073425 a(0)=0; for n>0, a(n) = number of primes not exceeding n-th composite number.

Table of values

n a(n)
0 0
1 2
2 3
3 4
4 4
5 4
6 5
7 6
8 6
9 6
10 7
11 8
12 8
13 8
14 9
15 9
16 9
17 9
18 9
19 10
20 11
21 11
22 11
23 11
24 11
25 12
26 12
27 12
28 13
29 14
30 14
31 14
32 15
33 15
34 15
35 15
36 15
37 16
38 16
39 16
40 16
41 16
42 17
43 18
44 18
45 18
46 18
47 18
48 19
49 19
50 19
51 20
52 21
53 21
54 21
55 21
56 21
57 22
58 22
59 22
60 23
61 23
62 23
63 23
64 23
65 24
66 24
67 24
68 24
69 24
70 24
71 24
72 25
73 25
74 25
75 26

List of values

[0, 2, 3, 4, 4, 4, 5, 6, 6, 6, 7, 8, 8, 8, 9, 9, 9, 9, 9, 10, 11, 11, 11, 11, 11, 12, 12, 12, 13, 14, 14, 14, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 17, 18, 18, 18, 18, 18, 19, 19, 19, 20, 21, 21, 21, 21, 21, 22, 22, 22, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 25, 25, 25, 26]

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

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