A350359 - cp's OEIS frontend

A350359 Lexicographically earliest infinite sequence of distinct positive integers such that for any four consecutive terms a,b,c,d, d is prime to a and c, but not to b.

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	15
8	14
9	5
10	7
11	25
12	21
13	10
14	27
15	16
16	33
17	20
18	11
19	26
20	77
21	6
22	35
23	12
24	49
25	18
26	91
27	22
28	13
29	24
30	65
31	28
32	55
33	32
34	45
35	34
36	39
37	17
38	57
39	68
40	19
41	40
42	133
43	30
44	119
45	36
46	161
47	38
48	23
49	44
50	69
51	50
52	51
53	52
54	63
55	46
56	75
57	58
58	81
59	29
60	93
61	116
62	31
63	56
64	155
65	42
66	85
67	48
68	95
69	54
70	115
71	62

[1, 2, 3, 4, 9, 8, 15, 14, 5, 7, 25, 21, 10, 27, 16, 33, 20, 11, 26, 77, 6, 35, 12, 49, 18, 91, 22, 13, 24, 65, 28, 55, 32, 45, 34, 39, 17, 57, 68, 19, 40, 133, 30, 119, 36, 161, 38, 23, 44, 69, 50, 51, 52, 63, 46, 75, 58, 81, 29, 93, 116, 31, 56, 155, 42, 85, 48, 95, 54, 115, 62]

cp's OEIS Frontend

A350359 Lexicographically earliest infinite sequence of distinct positive integers such that for any four consecutive terms a,b,c,d, d is prime to a and c, but not to b.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	15
8	14
9	5
10	7
11	25
12	21
13	10
14	27
15	16
16	33
17	20
18	11
19	26
20	77
21	6
22	35
23	12
24	49
25	18
26	91
27	22
28	13
29	24
30	65
31	28
32	55
33	32
34	45
35	34
36	39
37	17
38	57
39	68
40	19
41	40
42	133
43	30
44	119
45	36
46	161
47	38
48	23
49	44
50	69
51	50
52	51
53	52
54	63
55	46
56	75
57	58
58	81
59	29
60	93
61	116
62	31
63	56
64	155
65	42
66	85
67	48
68	95
69	54
70	115
71	62

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	15
8	14
9	5
10	7
11	25
12	21
13	10
14	27
15	16
16	33
17	20
18	11
19	26
20	77
21	6
22	35
23	12
24	49
25	18
26	91
27	22
28	13
29	24
30	65
31	28
32	55
33	32
34	45
35	34
36	39
37	17
38	57
39	68
40	19
41	40
42	133
43	30
44	119
45	36
46	161
47	38
48	23
49	44
50	69
51	50
52	51
53	52
54	63
55	46
56	75
57	58
58	81
59	29
60	93
61	116
62	31
63	56
64	155
65	42
66	85
67	48
68	95
69	54
70	115
71	62

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	15
8	14
9	5
10	7
11	25
12	21
13	10
14	27
15	16
16	33
17	20
18	11
19	26
20	77
21	6
22	35
23	12
24	49
25	18
26	91
27	22
28	13
29	24
30	65
31	28
32	55
33	32
34	45
35	34
36	39
37	17
38	57
39	68
40	19
41	40
42	133
43	30
44	119
45	36
46	161
47	38
48	23
49	44
50	69
51	50
52	51
53	52
54	63
55	46
56	75
57	58
58	81
59	29
60	93
61	116
62	31
63	56
64	155
65	42
66	85
67	48
68	95
69	54
70	115
71	62