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.

A064047 Number of numbers only appearing once in 1-to-n multiplication table.

Table of values

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

List of values

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

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

Content is available under The OEIS End-User License Agreement.