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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.

A327247 Number of odd prime powers <= n (with exponents > 0).

Table of values

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

List of values

[0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 8, 8, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 16, 16, 16, 16, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 20, 20, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 23, 23, 24, 24, 24]

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