A225745 - cp's OEIS frontend

A225745 Smallest k such that n numbers can be picked in {1,...,k} with no four in arithmetic progression.

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	8
7	9
8	10
9	13
10	15
11	17
12	19
13	21
14	23
15	25
16	27
17	28
18	30
19	33
20	34
21	37
22	40
23	43
24	45
25	48
26	50
27	53
28	54
29	58
30	60
31	64
32	66
33	68
34	70
35	74
36	77
37	79
38	82
39	84
40	87
41	91

[1, 2, 3, 5, 6, 8, 9, 10, 13, 15, 17, 19, 21, 23, 25, 27, 28, 30, 33, 34, 37, 40, 43, 45, 48, 50, 53, 54, 58, 60, 64, 66, 68, 70, 74, 77, 79, 82, 84, 87, 91]

cp's OEIS Frontend

A225745 Smallest k such that n numbers can be picked in {1,...,k} with no four in arithmetic progression.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	8
7	9
8	10
9	13
10	15
11	17
12	19
13	21
14	23
15	25
16	27
17	28
18	30
19	33
20	34
21	37
22	40
23	43
24	45
25	48
26	50
27	53
28	54
29	58
30	60
31	64
32	66
33	68
34	70
35	74
36	77
37	79
38	82
39	84
40	87
41	91

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	8
7	9
8	10
9	13
10	15
11	17
12	19
13	21
14	23
15	25
16	27
17	28
18	30
19	33
20	34
21	37
22	40
23	43
24	45
25	48
26	50
27	53
28	54
29	58
30	60
31	64
32	66
33	68
34	70
35	74
36	77
37	79
38	82
39	84
40	87
41	91

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	8
7	9
8	10
9	13
10	15
11	17
12	19
13	21
14	23
15	25
16	27
17	28
18	30
19	33
20	34
21	37
22	40
23	43
24	45
25	48
26	50
27	53
28	54
29	58
30	60
31	64
32	66
33	68
34	70
35	74
36	77
37	79
38	82
39	84
40	87
41	91