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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.

A373119 Cardinality of the largest subset of {1,...,n} such that no four distinct elements of this subset multiply to a square.

Table of values

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

List of values

[1, 2, 3, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 17, 17, 17, 17, 18, 18, 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 21, 21, 22, 22, 22, 22, 23, 23, 24, 24, 24, 24, 25, 25, 26, 26, 26]

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

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