A285492 - cp's OEIS frontend

A285492 a(n) is the least positive integer not already appearing such that no two distinct, unordered pairs of distinct 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	3
4	5
5	4
6	8
7	11
8	6
9	15
10	12
11	9
12	7
13	20
14	25
15	16
16	30
17	36
18	10
19	18
20	47
21	27
22	38
23	59
24	13
25	58
26	73
27	43
28	81
29	19
30	26
31	96
32	14
33	45
34	109
35	121
36	72
37	54
38	44
39	70
40	17
41	98
42	137
43	60
44	156
45	29
46	113
47	155
48	92
49	22
50	145
51	173
52	63
53	112
54	46
55	39
56	136
57	204
58	24
59	219
60	174
61	21
62	237
63	253
64	80

[1, 2, 3, 5, 4, 8, 11, 6, 15, 12, 9, 7, 20, 25, 16, 30, 36, 10, 18, 47, 27, 38, 59, 13, 58, 73, 43, 81, 19, 26, 96, 14, 45, 109, 121, 72, 54, 44, 70, 17, 98, 137, 60, 156, 29, 113, 155, 92, 22, 145, 173, 63, 112, 46, 39, 136, 204, 24, 219, 174, 21, 237, 253, 80]

cp's OEIS Frontend

A285492 a(n) is the least positive integer not already appearing such that no two distinct, unordered pairs of distinct 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	3
4	5
5	4
6	8
7	11
8	6
9	15
10	12
11	9
12	7
13	20
14	25
15	16
16	30
17	36
18	10
19	18
20	47
21	27
22	38
23	59
24	13
25	58
26	73
27	43
28	81
29	19
30	26
31	96
32	14
33	45
34	109
35	121
36	72
37	54
38	44
39	70
40	17
41	98
42	137
43	60
44	156
45	29
46	113
47	155
48	92
49	22
50	145
51	173
52	63
53	112
54	46
55	39
56	136
57	204
58	24
59	219
60	174
61	21
62	237
63	253
64	80

n	a(n)
1	1
2	2
3	3
4	5
5	4
6	8
7	11
8	6
9	15
10	12
11	9
12	7
13	20
14	25
15	16
16	30
17	36
18	10
19	18
20	47
21	27
22	38
23	59
24	13
25	58
26	73
27	43
28	81
29	19
30	26
31	96
32	14
33	45
34	109
35	121
36	72
37	54
38	44
39	70
40	17
41	98
42	137
43	60
44	156
45	29
46	113
47	155
48	92
49	22
50	145
51	173
52	63
53	112
54	46
55	39
56	136
57	204
58	24
59	219
60	174
61	21
62	237
63	253
64	80

n	a(n)
1	1
2	2
3	3
4	5
5	4
6	8
7	11
8	6
9	15
10	12
11	9
12	7
13	20
14	25
15	16
16	30
17	36
18	10
19	18
20	47
21	27
22	38
23	59
24	13
25	58
26	73
27	43
28	81
29	19
30	26
31	96
32	14
33	45
34	109
35	121
36	72
37	54
38	44
39	70
40	17
41	98
42	137
43	60
44	156
45	29
46	113
47	155
48	92
49	22
50	145
51	173
52	63
53	112
54	46
55	39
56	136
57	204
58	24
59	219
60	174
61	21
62	237
63	253
64	80