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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.

A356068 Number of integers ranging from 1 to n that are not prime-powers (1 is not a prime-power).

Table of values

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

List of values

[1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 4, 4, 5, 6, 6, 6, 7, 7, 8, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 14, 15, 16, 17, 18, 18, 19, 20, 21, 21, 22, 22, 23, 24, 25, 25, 26, 26, 27, 28, 29, 29, 30, 31, 32, 33, 34, 34, 35, 35, 36, 37, 37, 38, 39, 39, 40, 41, 42]

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

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