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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.

A003003 Size of the largest subset of the numbers [1...n] which doesn't contain a 4-term arithmetic progression.

Table of values

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

List of values

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

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

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