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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.

A385199 The number of integers k from 1 to n such that the greatest divisor of k that is either 1 or a prime power (A000961).

Table of values

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

List of values

[1, 2, 3, 4, 5, 5, 7, 8, 9, 9, 11, 11, 13, 13, 14, 16, 17, 17, 19, 19, 20, 21, 23, 23, 25, 25, 27, 27, 29, 22, 31, 32, 32, 33, 34, 35, 37, 37, 38, 39, 41, 32, 43, 43, 44, 45, 47, 47, 49, 49, 50, 51, 53, 53, 54, 55, 56, 57, 59, 50, 61, 61, 62, 64, 64, 52, 67, 67]

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

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