A366908 - cp's OEIS frontend

A366908 Lexicographically earliest infinite sequence of distinct positive integers such that, for n > 1, a(n) shares a factor with n but does not equal n, while not sharing a factor with a(n-1).

n	a(n)
1	1
2	4
3	9
4	2
5	15
6	8
7	21
8	10
9	3
10	5
11	22
12	27
13	26
14	7
15	25
16	6
17	85
18	12
19	95
20	14
21	33
22	16
23	69
24	28
25	45
26	13
27	18
28	35
29	58
30	39
31	155
32	24
33	11
34	17
35	20
36	51
37	74
38	19
39	36
40	55
41	82
42	49
43	86
44	77
45	30
46	23
47	94
48	57
49	56
50	65
51	34
52	91
53	106
54	63
55	40
56	119
57	38
58	29
59	118
60	75
61	122
62	31
63	81
64	32
65	105
66	44
67	201
68	46
69	87
70	50
71	213
72	52
73	219
74	37

[1, 4, 9, 2, 15, 8, 21, 10, 3, 5, 22, 27, 26, 7, 25, 6, 85, 12, 95, 14, 33, 16, 69, 28, 45, 13, 18, 35, 58, 39, 155, 24, 11, 17, 20, 51, 74, 19, 36, 55, 82, 49, 86, 77, 30, 23, 94, 57, 56, 65, 34, 91, 106, 63, 40, 119, 38, 29, 118, 75, 122, 31, 81, 32, 105, 44, 201, 46, 87, 50, 213, 52, 219, 37]

cp's OEIS Frontend

A366908 Lexicographically earliest infinite sequence of distinct positive integers such that, for n > 1, a(n) shares a factor with n but does not equal n, while not sharing a factor with a(n-1).

Table of values

List of values

n	a(n)
1	1
2	4
3	9
4	2
5	15
6	8
7	21
8	10
9	3
10	5
11	22
12	27
13	26
14	7
15	25
16	6
17	85
18	12
19	95
20	14
21	33
22	16
23	69
24	28
25	45
26	13
27	18
28	35
29	58
30	39
31	155
32	24
33	11
34	17
35	20
36	51
37	74
38	19
39	36
40	55
41	82
42	49
43	86
44	77
45	30
46	23
47	94
48	57
49	56
50	65
51	34
52	91
53	106
54	63
55	40
56	119
57	38
58	29
59	118
60	75
61	122
62	31
63	81
64	32
65	105
66	44
67	201
68	46
69	87
70	50
71	213
72	52
73	219
74	37

n	a(n)
1	1
2	4
3	9
4	2
5	15
6	8
7	21
8	10
9	3
10	5
11	22
12	27
13	26
14	7
15	25
16	6
17	85
18	12
19	95
20	14
21	33
22	16
23	69
24	28
25	45
26	13
27	18
28	35
29	58
30	39
31	155
32	24
33	11
34	17
35	20
36	51
37	74
38	19
39	36
40	55
41	82
42	49
43	86
44	77
45	30
46	23
47	94
48	57
49	56
50	65
51	34
52	91
53	106
54	63
55	40
56	119
57	38
58	29
59	118
60	75
61	122
62	31
63	81
64	32
65	105
66	44
67	201
68	46
69	87
70	50
71	213
72	52
73	219
74	37

n	a(n)
1	1
2	4
3	9
4	2
5	15
6	8
7	21
8	10
9	3
10	5
11	22
12	27
13	26
14	7
15	25
16	6
17	85
18	12
19	95
20	14
21	33
22	16
23	69
24	28
25	45
26	13
27	18
28	35
29	58
30	39
31	155
32	24
33	11
34	17
35	20
36	51
37	74
38	19
39	36
40	55
41	82
42	49
43	86
44	77
45	30
46	23
47	94
48	57
49	56
50	65
51	34
52	91
53	106
54	63
55	40
56	119
57	38
58	29
59	118
60	75
61	122
62	31
63	81
64	32
65	105
66	44
67	201
68	46
69	87
70	50
71	213
72	52
73	219
74	37