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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.

A144774 Number of positive integers k less than n such that rad(k) < rad(n).

Table of values

n a(n)
1 0
2 1
3 2
4 1
5 4
6 5
7 6
8 1
9 4
10 9
11 10
12 7
13 12
14 13
15 14
16 1
17 16
18 8
19 18
20 12
21 20
22 21
23 22
24 8
25 7
26 25
27 5
28 19
29 28
30 29
31 30
32 1
33 32
34 33
35 34
36 11
37 36
38 37
39 38
40 17
41 40
42 41
43 42
44 28
45 24
46 45
47 46
48 11
49 17
50 19
51 50
52 35
53 52
54 11
55 54
56 26
57 56
58 57
59 58
60 40
61 60
62 61
63 33
64 1
65 64
66 65
67 66
68 46
69 68
70 69
71 70
72 12
73 72
74 73
75 31
76 52
77 76

List of values

[0, 1, 2, 1, 4, 5, 6, 1, 4, 9, 10, 7, 12, 13, 14, 1, 16, 8, 18, 12, 20, 21, 22, 8, 7, 25, 5, 19, 28, 29, 30, 1, 32, 33, 34, 11, 36, 37, 38, 17, 40, 41, 42, 28, 24, 45, 46, 11, 17, 19, 50, 35, 52, 11, 54, 26, 56, 57, 58, 40, 60, 61, 33, 1, 64, 65, 66, 46, 68, 69, 70, 12, 72, 73, 31, 52, 76]

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