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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.

A074990 Number of primes in the interval (n,3n].

Table of values

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

List of values

[2, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 8, 9, 8, 9, 8, 9, 10, 10, 10, 11, 12, 12, 13, 14, 13, 14, 13, 13, 14, 15, 16, 17, 17, 18, 18, 18, 17, 17, 17, 18, 18, 19, 19, 19, 19, 20, 21, 21, 21, 21, 22, 23, 23, 24, 23, 24, 24, 24, 24, 25, 26, 27, 27, 27, 27, 27, 27, 27, 26, 26, 27, 28]

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