A367742 - cp's OEIS frontend

A367742 Lexicographically earliest infinite sequence of distinct positive numbers such that, for n>3, a(n) has a common factor with a(n-2) and n but not with a(n-1).

n	a(n)
1	1
2	2
3	3
4	4
5	15
6	8
7	21
8	10
9	9
10	5
11	33
12	20
13	39
14	14
15	27
16	16
17	51
18	22
19	57
20	26
21	45
22	28
23	69
24	32
25	75
26	34
27	63
28	38
29	87
30	40
31	93
32	44
33	81
34	46
35	105
36	52
37	111
38	50
39	99
40	25
41	123
42	35
43	129
44	55
45	6
46	115
47	94
48	135
49	56
50	65
51	12
52	13
53	106
54	117
55	80
56	91
57	18
58	203
59	118
60	145
61	122
62	155
63	183
64	62
65	165
66	58
67	201
68	64
69	141
70	68
71	213

[1, 2, 3, 4, 15, 8, 21, 10, 9, 5, 33, 20, 39, 14, 27, 16, 51, 22, 57, 26, 45, 28, 69, 32, 75, 34, 63, 38, 87, 40, 93, 44, 81, 46, 105, 52, 111, 50, 99, 25, 123, 35, 129, 55, 6, 115, 94, 135, 56, 65, 12, 13, 106, 117, 80, 91, 18, 203, 118, 145, 122, 155, 183, 62, 165, 58, 201, 64, 141, 68, 213]

cp's OEIS Frontend

A367742 Lexicographically earliest infinite sequence of distinct positive numbers such that, for n>3, a(n) has a common factor with a(n-2) and n but not with a(n-1).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	15
6	8
7	21
8	10
9	9
10	5
11	33
12	20
13	39
14	14
15	27
16	16
17	51
18	22
19	57
20	26
21	45
22	28
23	69
24	32
25	75
26	34
27	63
28	38
29	87
30	40
31	93
32	44
33	81
34	46
35	105
36	52
37	111
38	50
39	99
40	25
41	123
42	35
43	129
44	55
45	6
46	115
47	94
48	135
49	56
50	65
51	12
52	13
53	106
54	117
55	80
56	91
57	18
58	203
59	118
60	145
61	122
62	155
63	183
64	62
65	165
66	58
67	201
68	64
69	141
70	68
71	213

n	a(n)
1	1
2	2
3	3
4	4
5	15
6	8
7	21
8	10
9	9
10	5
11	33
12	20
13	39
14	14
15	27
16	16
17	51
18	22
19	57
20	26
21	45
22	28
23	69
24	32
25	75
26	34
27	63
28	38
29	87
30	40
31	93
32	44
33	81
34	46
35	105
36	52
37	111
38	50
39	99
40	25
41	123
42	35
43	129
44	55
45	6
46	115
47	94
48	135
49	56
50	65
51	12
52	13
53	106
54	117
55	80
56	91
57	18
58	203
59	118
60	145
61	122
62	155
63	183
64	62
65	165
66	58
67	201
68	64
69	141
70	68
71	213

n	a(n)
1	1
2	2
3	3
4	4
5	15
6	8
7	21
8	10
9	9
10	5
11	33
12	20
13	39
14	14
15	27
16	16
17	51
18	22
19	57
20	26
21	45
22	28
23	69
24	32
25	75
26	34
27	63
28	38
29	87
30	40
31	93
32	44
33	81
34	46
35	105
36	52
37	111
38	50
39	99
40	25
41	123
42	35
43	129
44	55
45	6
46	115
47	94
48	135
49	56
50	65
51	12
52	13
53	106
54	117
55	80
56	91
57	18
58	203
59	118
60	145
61	122
62	155
63	183
64	62
65	165
66	58
67	201
68	64
69	141
70	68
71	213