A285493 - cp's OEIS frontend

A285493 a(n) is the least positive integer not already appearing 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	2
3	4
4	3
5	6
6	10
7	15
8	5
9	13
10	9
11	18
12	29
13	7
14	25
15	37
16	8
17	22
18	14
19	41
20	48
21	23
22	58
23	11
24	66
25	32
26	78
27	24
28	52
29	83
30	12
31	73
32	93
33	26
34	60
35	42
36	118
37	21
38	89
39	65
40	106
41	139
42	145
43	19
44	84
45	16
46	162
47	76
48	43
49	173
50	183
51	199
52	123
53	87
54	30
55	28
56	161
57	101
58	56
59	116
60	55
61	235
62	182
63	150

[1, 2, 4, 3, 6, 10, 15, 5, 13, 9, 18, 29, 7, 25, 37, 8, 22, 14, 41, 48, 23, 58, 11, 66, 32, 78, 24, 52, 83, 12, 73, 93, 26, 60, 42, 118, 21, 89, 65, 106, 139, 145, 19, 84, 16, 162, 76, 43, 173, 183, 199, 123, 87, 30, 28, 161, 101, 56, 116, 55, 235, 182, 150]

cp's OEIS Frontend

A285493 a(n) is the least positive integer not already appearing 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	2
3	4
4	3
5	6
6	10
7	15
8	5
9	13
10	9
11	18
12	29
13	7
14	25
15	37
16	8
17	22
18	14
19	41
20	48
21	23
22	58
23	11
24	66
25	32
26	78
27	24
28	52
29	83
30	12
31	73
32	93
33	26
34	60
35	42
36	118
37	21
38	89
39	65
40	106
41	139
42	145
43	19
44	84
45	16
46	162
47	76
48	43
49	173
50	183
51	199
52	123
53	87
54	30
55	28
56	161
57	101
58	56
59	116
60	55
61	235
62	182
63	150

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	10
7	15
8	5
9	13
10	9
11	18
12	29
13	7
14	25
15	37
16	8
17	22
18	14
19	41
20	48
21	23
22	58
23	11
24	66
25	32
26	78
27	24
28	52
29	83
30	12
31	73
32	93
33	26
34	60
35	42
36	118
37	21
38	89
39	65
40	106
41	139
42	145
43	19
44	84
45	16
46	162
47	76
48	43
49	173
50	183
51	199
52	123
53	87
54	30
55	28
56	161
57	101
58	56
59	116
60	55
61	235
62	182
63	150

n	a(n)
1	1
2	2
3	4
4	3
5	6
6	10
7	15
8	5
9	13
10	9
11	18
12	29
13	7
14	25
15	37
16	8
17	22
18	14
19	41
20	48
21	23
22	58
23	11
24	66
25	32
26	78
27	24
28	52
29	83
30	12
31	73
32	93
33	26
34	60
35	42
36	118
37	21
38	89
39	65
40	106
41	139
42	145
43	19
44	84
45	16
46	162
47	76
48	43
49	173
50	183
51	199
52	123
53	87
54	30
55	28
56	161
57	101
58	56
59	116
60	55
61	235
62	182
63	150