A057561 - cp's OEIS frontend

A057561 Size of the largest set encompassing no {x, 2x, 3x} contained in D(n) = the first n 3-smooth numbers {1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 27, ...} (A003586).

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

[1, 2, 2, 3, 4, 5, 5, 6, 7, 7, 8, 8, 9, 10, 11, 11, 12, 13, 13, 14, 14, 15, 16, 17, 17, 18, 18, 19, 20, 21, 21, 22, 22, 23, 24, 25, 25, 26, 26, 27, 28, 29, 30, 30, 31, 31, 32, 33, 33, 34, 35, 35, 36, 36, 37, 38, 39, 39, 40, 41, 42, 42, 42, 43, 44, 45, 45, 46, 47]

cp's OEIS Frontend

A057561 Size of the largest set encompassing no {x, 2x, 3x} contained in D(n) = the first n 3-smooth numbers {1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 27, ...} (A003586).

Table of values

List of values

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

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

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