A285491 - cp's OEIS frontend

A285491 Lexicographically earliest sequence of positive integers such that no two distinct unordered pairs of points ((n, a(n)), (m, a(m))) and ((k, a(k)), (j, a(j))) have the same midpoint.

n	a(n)
1	1
2	1
3	2
4	1
5	4
6	6
7	2
8	9
9	1
10	13
11	8
12	19
13	2
14	15
15	12
16	28
17	32
18	6
19	4
20	18
21	43
22	1
23	51
24	16
25	36
26	41
27	28
28	34
29	2
30	57
31	66
32	10
33	80
34	5
35	31
36	24
37	61
38	71
39	89
40	12
41	107
42	128
43	18
44	99
45	42
46	1
47	123
48	142
49	10
50	38
51	78
52	164
53	120
54	21
55	1
56	58
57	183
58	169
59	99
60	93
61	203
62	22
63	200
64	155
65	7
66	130
67	228

[1, 1, 2, 1, 4, 6, 2, 9, 1, 13, 8, 19, 2, 15, 12, 28, 32, 6, 4, 18, 43, 1, 51, 16, 36, 41, 28, 34, 2, 57, 66, 10, 80, 5, 31, 24, 61, 71, 89, 12, 107, 128, 18, 99, 42, 1, 123, 142, 10, 38, 78, 164, 120, 21, 1, 58, 183, 169, 99, 93, 203, 22, 200, 155, 7, 130, 228]

cp's OEIS Frontend

A285491 Lexicographically earliest sequence of positive integers such that no two distinct unordered pairs of points ((n, a(n)), (m, a(m))) and ((k, a(k)), (j, a(j))) have the same midpoint.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	4
6	6
7	2
8	9
9	1
10	13
11	8
12	19
13	2
14	15
15	12
16	28
17	32
18	6
19	4
20	18
21	43
22	1
23	51
24	16
25	36
26	41
27	28
28	34
29	2
30	57
31	66
32	10
33	80
34	5
35	31
36	24
37	61
38	71
39	89
40	12
41	107
42	128
43	18
44	99
45	42
46	1
47	123
48	142
49	10
50	38
51	78
52	164
53	120
54	21
55	1
56	58
57	183
58	169
59	99
60	93
61	203
62	22
63	200
64	155
65	7
66	130
67	228

n	a(n)
1	1
2	1
3	2
4	1
5	4
6	6
7	2
8	9
9	1
10	13
11	8
12	19
13	2
14	15
15	12
16	28
17	32
18	6
19	4
20	18
21	43
22	1
23	51
24	16
25	36
26	41
27	28
28	34
29	2
30	57
31	66
32	10
33	80
34	5
35	31
36	24
37	61
38	71
39	89
40	12
41	107
42	128
43	18
44	99
45	42
46	1
47	123
48	142
49	10
50	38
51	78
52	164
53	120
54	21
55	1
56	58
57	183
58	169
59	99
60	93
61	203
62	22
63	200
64	155
65	7
66	130
67	228

n	a(n)
1	1
2	1
3	2
4	1
5	4
6	6
7	2
8	9
9	1
10	13
11	8
12	19
13	2
14	15
15	12
16	28
17	32
18	6
19	4
20	18
21	43
22	1
23	51
24	16
25	36
26	41
27	28
28	34
29	2
30	57
31	66
32	10
33	80
34	5
35	31
36	24
37	61
38	71
39	89
40	12
41	107
42	128
43	18
44	99
45	42
46	1
47	123
48	142
49	10
50	38
51	78
52	164
53	120
54	21
55	1
56	58
57	183
58	169
59	99
60	93
61	203
62	22
63	200
64	155
65	7
66	130
67	228