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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.

A111939 Number of primes < semiprime(n).

Table of values

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

List of values

[2, 3, 4, 4, 6, 6, 8, 8, 9, 9, 11, 11, 11, 12, 12, 14, 15, 15, 16, 16, 16, 18, 18, 19, 21, 21, 22, 23, 23, 23, 24, 24, 24, 24, 27, 29, 30, 30, 30, 30, 30, 30, 31, 32, 32, 34, 34, 34, 34, 34, 36, 37, 37, 37, 38, 39, 40, 40, 42, 42, 42, 44, 46, 46, 46, 46, 46, 46, 47, 47, 47, 47, 47]

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