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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.

A055037 Number of numbers <= n with an even number of prime factors (counted with multiplicity).

Table of values

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

List of values

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

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

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