A353239 - cp's OEIS frontend

A353239 Lexicographically earliest infinite sequence of distinct positive numbers such that, for n > 2, a(n) has either a common factor with a(n-1) but not with a(n-2), or with a(n-2) but not with a(n-1).

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	10
8	5
9	6
10	14
11	7
12	12
13	15
14	16
15	21
16	20
17	22
18	11
19	18
20	26
21	13
22	24
23	27
24	28
25	32
26	35
27	25
28	42
29	33
30	34
31	17
32	30
33	36
34	55
35	38
36	19
37	40
38	44
39	45
40	39
41	50
42	46
43	23
44	48
45	51
46	52
47	56
48	49
49	54
50	57
51	58
52	29
53	60
54	62
55	31
56	64
57	66
58	63
59	68
60	69
61	70
62	65
63	72
64	74
65	37
66	76
67	78
68	75
69	82
70	41
71	80
72	84
73	77
74	81
75	87
76	116

[1, 2, 3, 4, 9, 8, 10, 5, 6, 14, 7, 12, 15, 16, 21, 20, 22, 11, 18, 26, 13, 24, 27, 28, 32, 35, 25, 42, 33, 34, 17, 30, 36, 55, 38, 19, 40, 44, 45, 39, 50, 46, 23, 48, 51, 52, 56, 49, 54, 57, 58, 29, 60, 62, 31, 64, 66, 63, 68, 69, 70, 65, 72, 74, 37, 76, 78, 75, 82, 41, 80, 84, 77, 81, 87, 116]

cp's OEIS Frontend

A353239 Lexicographically earliest infinite sequence of distinct positive numbers such that, for n > 2, a(n) has either a common factor with a(n-1) but not with a(n-2), or with a(n-2) but not with a(n-1).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	10
8	5
9	6
10	14
11	7
12	12
13	15
14	16
15	21
16	20
17	22
18	11
19	18
20	26
21	13
22	24
23	27
24	28
25	32
26	35
27	25
28	42
29	33
30	34
31	17
32	30
33	36
34	55
35	38
36	19
37	40
38	44
39	45
40	39
41	50
42	46
43	23
44	48
45	51
46	52
47	56
48	49
49	54
50	57
51	58
52	29
53	60
54	62
55	31
56	64
57	66
58	63
59	68
60	69
61	70
62	65
63	72
64	74
65	37
66	76
67	78
68	75
69	82
70	41
71	80
72	84
73	77
74	81
75	87
76	116

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	10
8	5
9	6
10	14
11	7
12	12
13	15
14	16
15	21
16	20
17	22
18	11
19	18
20	26
21	13
22	24
23	27
24	28
25	32
26	35
27	25
28	42
29	33
30	34
31	17
32	30
33	36
34	55
35	38
36	19
37	40
38	44
39	45
40	39
41	50
42	46
43	23
44	48
45	51
46	52
47	56
48	49
49	54
50	57
51	58
52	29
53	60
54	62
55	31
56	64
57	66
58	63
59	68
60	69
61	70
62	65
63	72
64	74
65	37
66	76
67	78
68	75
69	82
70	41
71	80
72	84
73	77
74	81
75	87
76	116

n	a(n)
1	1
2	2
3	3
4	4
5	9
6	8
7	10
8	5
9	6
10	14
11	7
12	12
13	15
14	16
15	21
16	20
17	22
18	11
19	18
20	26
21	13
22	24
23	27
24	28
25	32
26	35
27	25
28	42
29	33
30	34
31	17
32	30
33	36
34	55
35	38
36	19
37	40
38	44
39	45
40	39
41	50
42	46
43	23
44	48
45	51
46	52
47	56
48	49
49	54
50	57
51	58
52	29
53	60
54	62
55	31
56	64
57	66
58	63
59	68
60	69
61	70
62	65
63	72
64	74
65	37
66	76
67	78
68	75
69	82
70	41
71	80
72	84
73	77
74	81
75	87
76	116