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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.

A100719 Size of the largest subset of {1,2,...,n} such that no two distinct elements differ by a perfect square.

Table of values

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

List of values

[1, 1, 2, 2, 2, 3, 3, 4, 4, 4, 5, 5, 6, 6, 6, 7, 7, 8, 8, 8, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 18, 18, 18, 19, 19, 20]

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