A354790 - cp's OEIS frontend

A354790 a(n) is the least positive squarefree number not already used that is coprime to the previous floor(n/2) terms.

n	a(n)
1	1
2	2
3	3
4	5
5	7
6	11
7	6
8	13
9	17
10	19
11	23
12	29
13	31
14	35
15	22
16	37
17	39
18	41
19	43
20	47
21	53
22	59
23	61
24	67
25	71
26	73
27	79
28	83
29	85
30	89
31	14
32	97
33	101
34	103
35	33
36	107
37	109
38	113
39	127
40	131
41	137
42	139
43	149
44	151
45	157
46	163
47	167
48	173
49	179
50	181
51	191
52	193
53	197
54	199
55	211
56	223
57	227
58	229
59	65
60	233

[1, 2, 3, 5, 7, 11, 6, 13, 17, 19, 23, 29, 31, 35, 22, 37, 39, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 85, 89, 14, 97, 101, 103, 33, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 65, 233]

cp's OEIS Frontend

A354790 a(n) is the least positive squarefree number not already used that is coprime to the previous floor(n/2) terms.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	5
5	7
6	11
7	6
8	13
9	17
10	19
11	23
12	29
13	31
14	35
15	22
16	37
17	39
18	41
19	43
20	47
21	53
22	59
23	61
24	67
25	71
26	73
27	79
28	83
29	85
30	89
31	14
32	97
33	101
34	103
35	33
36	107
37	109
38	113
39	127
40	131
41	137
42	139
43	149
44	151
45	157
46	163
47	167
48	173
49	179
50	181
51	191
52	193
53	197
54	199
55	211
56	223
57	227
58	229
59	65
60	233

n	a(n)
1	1
2	2
3	3
4	5
5	7
6	11
7	6
8	13
9	17
10	19
11	23
12	29
13	31
14	35
15	22
16	37
17	39
18	41
19	43
20	47
21	53
22	59
23	61
24	67
25	71
26	73
27	79
28	83
29	85
30	89
31	14
32	97
33	101
34	103
35	33
36	107
37	109
38	113
39	127
40	131
41	137
42	139
43	149
44	151
45	157
46	163
47	167
48	173
49	179
50	181
51	191
52	193
53	197
54	199
55	211
56	223
57	227
58	229
59	65
60	233

n	a(n)
1	1
2	2
3	3
4	5
5	7
6	11
7	6
8	13
9	17
10	19
11	23
12	29
13	31
14	35
15	22
16	37
17	39
18	41
19	43
20	47
21	53
22	59
23	61
24	67
25	71
26	73
27	79
28	83
29	85
30	89
31	14
32	97
33	101
34	103
35	33
36	107
37	109
38	113
39	127
40	131
41	137
42	139
43	149
44	151
45	157
46	163
47	167
48	173
49	179
50	181
51	191
52	193
53	197
54	199
55	211
56	223
57	227
58	229
59	65
60	233