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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.

A025528 Number of prime powers <= n with exponents > 0 (A246655).

Table of values

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

List of values

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

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