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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.

A378020 a(n) = pi(A020482(n)) - pi(A020481(n)).

Table of values

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

List of values

[0, 0, 1, 2, 1, 3, 4, 3, 5, 6, 5, 7, 6, 5, 8, 9, 8, 7, 10, 9, 11, 12, 11, 13, 12, 11, 14, 13, 12, 15, 16, 15, 14, 17, 16, 18, 19, 18, 17, 20, 19, 21, 20, 19, 22, 21, 20, 14, 23, 22, 24, 25, 24, 26, 27, 26, 28, 27, 26, 23, 25, 24, 21, 29, 28, 30, 29, 28, 31, 32, 31, 30, 28, 29, 33, 34]

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