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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.

A072613 Number of numbers of the form p*q (p, q distinct primes) less than or equal to n.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 1
7 1
8 1
9 1
10 2
11 2
12 2
13 2
14 3
15 4
16 4
17 4
18 4
19 4
20 4
21 5
22 6
23 6
24 6
25 6
26 7
27 7
28 7
29 7
30 7
31 7
32 7
33 8
34 9
35 10
36 10
37 10
38 11
39 12
40 12
41 12
42 12
43 12
44 12
45 12
46 13
47 13
48 13
49 13
50 13
51 14
52 14
53 14
54 14
55 15
56 15
57 16
58 17
59 17
60 17
61 17
62 18
63 18
64 18
65 19
66 19
67 19
68 19
69 20
70 20
71 20
72 20
73 20
74 21
75 21
76 21
77 22
78 22
79 22
80 22

List of values

[0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 4, 4, 4, 4, 4, 4, 5, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 8, 9, 10, 10, 10, 11, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 16, 17, 17, 17, 17, 18, 18, 18, 19, 19, 19, 19, 20, 20, 20, 20, 20, 21, 21, 21, 22, 22, 22, 22]

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