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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.

A242493 a(n) is the number of not-sqrt-smooth numbers ("jagged" numbers) not exceeding n. This is the counting function of A064052.

Table of values

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

List of values

[0, 1, 2, 2, 3, 4, 5, 5, 5, 6, 7, 7, 8, 9, 10, 10, 11, 11, 12, 13, 14, 15, 16, 16, 16, 17, 17, 18, 19, 19, 20, 20, 21, 22, 23, 23, 24, 25, 26, 26, 27, 28, 29, 30, 30, 31, 32, 32, 32, 32, 33, 34, 35, 35, 36, 36, 37, 38, 39, 39, 40, 41, 41, 41, 42, 43, 44, 45]

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

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