A347499 - cp's OEIS frontend

A347499 Triangle read by rows: n-th row is the lexicographically earliest n-element subset of {1,2,3,...,A347498(n)} with the property that all products i * j are distinct for i <= j.

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	3
7	1
8	2
9	3
10	5
11	1
12	3
13	4
14	5
15	6
16	1
17	3
18	4
19	5
20	6
21	7
22	1
23	2
24	5
25	6
26	7
27	8
28	9
29	1
30	2
31	5
32	6
33	7
34	8
35	9
36	11
37	1
38	2
39	5
40	6
41	7
42	8
43	9
44	11
45	13
46	1
47	2
48	5
49	7
50	8
51	9
52	11
53	12
54	13
55	15
56	1
57	2
58	5
59	7
60	8
61	9
62	11
63	12
64	13
65	15
66	17
67	1
68	2
69	5
70	7
71	8
72	9
73	11
74	12
75	13
76	15
77	17
78	19

[1, 1, 2, 1, 2, 3, 1, 2, 3, 5, 1, 3, 4, 5, 6, 1, 3, 4, 5, 6, 7, 1, 2, 5, 6, 7, 8, 9, 1, 2, 5, 6, 7, 8, 9, 11, 1, 2, 5, 6, 7, 8, 9, 11, 13, 1, 2, 5, 7, 8, 9, 11, 12, 13, 15, 1, 2, 5, 7, 8, 9, 11, 12, 13, 15, 17, 1, 2, 5, 7, 8, 9, 11, 12, 13, 15, 17, 19]

cp's OEIS Frontend

A347499 Triangle read by rows: n-th row is the lexicographically earliest n-element subset of {1,2,3,...,A347498(n)} with the property that all products i * j are distinct for i <= j.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	3
7	1
8	2
9	3
10	5
11	1
12	3
13	4
14	5
15	6
16	1
17	3
18	4
19	5
20	6
21	7
22	1
23	2
24	5
25	6
26	7
27	8
28	9
29	1
30	2
31	5
32	6
33	7
34	8
35	9
36	11
37	1
38	2
39	5
40	6
41	7
42	8
43	9
44	11
45	13
46	1
47	2
48	5
49	7
50	8
51	9
52	11
53	12
54	13
55	15
56	1
57	2
58	5
59	7
60	8
61	9
62	11
63	12
64	13
65	15
66	17
67	1
68	2
69	5
70	7
71	8
72	9
73	11
74	12
75	13
76	15
77	17
78	19

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	3
7	1
8	2
9	3
10	5
11	1
12	3
13	4
14	5
15	6
16	1
17	3
18	4
19	5
20	6
21	7
22	1
23	2
24	5
25	6
26	7
27	8
28	9
29	1
30	2
31	5
32	6
33	7
34	8
35	9
36	11
37	1
38	2
39	5
40	6
41	7
42	8
43	9
44	11
45	13
46	1
47	2
48	5
49	7
50	8
51	9
52	11
53	12
54	13
55	15
56	1
57	2
58	5
59	7
60	8
61	9
62	11
63	12
64	13
65	15
66	17
67	1
68	2
69	5
70	7
71	8
72	9
73	11
74	12
75	13
76	15
77	17
78	19

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	3
7	1
8	2
9	3
10	5
11	1
12	3
13	4
14	5
15	6
16	1
17	3
18	4
19	5
20	6
21	7
22	1
23	2
24	5
25	6
26	7
27	8
28	9
29	1
30	2
31	5
32	6
33	7
34	8
35	9
36	11
37	1
38	2
39	5
40	6
41	7
42	8
43	9
44	11
45	13
46	1
47	2
48	5
49	7
50	8
51	9
52	11
53	12
54	13
55	15
56	1
57	2
58	5
59	7
60	8
61	9
62	11
63	12
64	13
65	15
66	17
67	1
68	2
69	5
70	7
71	8
72	9
73	11
74	12
75	13
76	15
77	17
78	19