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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.

A065515 Number of prime powers <= n.

Table of values

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

List of values

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

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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