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.

A123066 (Number of numbers <= n with an odd number of distinct prime factors) - (number of numbers <= n with an even number of distinct prime factors).

Table of values

n a(n)
1 0
2 1
3 2
4 3
5 4
6 3
7 4
8 5
9 6
10 5
11 6
12 5
13 6
14 5
15 4
16 5
17 6
18 5
19 6
20 5
21 4
22 3
23 4
24 3
25 4
26 3
27 4
28 3
29 4
30 5
31 6
32 7
33 6
34 5
35 4
36 3
37 4
38 3
39 2
40 1
41 2
42 3
43 4
44 3
45 2
46 1
47 2
48 1
49 2
50 1
51 0
52 -1
53 0
54 -1
55 -2
56 -3
57 -4
58 -5
59 -4
60 -3
61 -2
62 -3
63 -4
64 -3
65 -4
66 -3
67 -2
68 -3
69 -4
70 -3
71 -2
72 -3
73 -2
74 -3
75 -4
76 -5
77 -6
78 -5
79 -4
80 -5
81 -4
82 -5
83 -4
84 -3
85 -4
86 -5
87 -6
88 -7
89 -6
90 -5
91 -6
92 -7
93 -8
94 -9
95 -10

List of values

[0, 1, 2, 3, 4, 3, 4, 5, 6, 5, 6, 5, 6, 5, 4, 5, 6, 5, 6, 5, 4, 3, 4, 3, 4, 3, 4, 3, 4, 5, 6, 7, 6, 5, 4, 3, 4, 3, 2, 1, 2, 3, 4, 3, 2, 1, 2, 1, 2, 1, 0, -1, 0, -1, -2, -3, -4, -5, -4, -3, -2, -3, -4, -3, -4, -3, -2, -3, -4, -3, -2, -3, -2, -3, -4, -5, -6, -5, -4, -5, -4, -5, -4, -3, -4, -5, -6, -7, -6, -5, -6, -7, -8, -9, -10]