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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.

A294602 a(n) = pi(n-1) - pi(floor(n/2)), where pi is A000720.

Table of values

n a(n)
1 0
2 0
3 1
4 1
5 1
6 1
7 1
8 2
9 2
10 1
11 1
12 2
13 2
14 2
15 2
16 2
17 2
18 3
19 3
20 4
21 4
22 3
23 3
24 4
25 4
26 3
27 3
28 3
29 3
30 4
31 4
32 5
33 5
34 4
35 4
36 4
37 4
38 4
39 4
40 4
41 4
42 5
43 5
44 6
45 6
46 5
47 5
48 6
49 6
50 6
51 6
52 6
53 6
54 7
55 7
56 7
57 7
58 6
59 6
60 7
61 7
62 7
63 7
64 7
65 7
66 7
67 7
68 8
69 8
70 8
71 8
72 9
73 9
74 9
75 9
76 9
77 9
78 9
79 9
80 10
81 10
82 9
83 9
84 10
85 10
86 9

List of values

[0, 0, 1, 1, 1, 1, 1, 2, 2, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 3, 3, 4, 4, 3, 3, 3, 3, 4, 4, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 6, 6, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 9, 9, 10, 10, 9]

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