cp's OEIS Frontend

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.

A055038 Number of numbers <= n with an odd number of prime factors (counted with multiplicity).

Table of values

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

List of values

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

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

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