A366909 - cp's OEIS frontend

A366909 Lexicographically earliest infinite sequence of distinct positive integers such that, for n > 2, a(n) shares a factor with a(n-1) but not with n.

n	a(n)
1	1
2	5
3	10
4	15
5	21
6	35
7	20
8	25
9	55
10	33
11	30
12	65
13	40
14	85
15	17
16	51
17	39
18	13
19	26
20	91
21	52
22	117
23	42
24	7
25	14
26	49
27	70
28	45
29	57
30	19
31	38
32	95
33	50
34	75
35	66
36	11
37	22
38	77
39	28
40	63
41	60
42	115
43	23
44	69
45	161
46	105
47	56
48	119
49	34
50	187
51	44
52	99
53	78
54	143
55	104
56	169
57	130
58	125
59	110
60	121
61	88
62	165
63	80
64	135
65	84
66	133
67	76
68	171
69	152
70	209

[1, 5, 10, 15, 21, 35, 20, 25, 55, 33, 30, 65, 40, 85, 17, 51, 39, 13, 26, 91, 52, 117, 42, 7, 14, 49, 70, 45, 57, 19, 38, 95, 50, 75, 66, 11, 22, 77, 28, 63, 60, 115, 23, 69, 161, 105, 56, 119, 34, 187, 44, 99, 78, 143, 104, 169, 130, 125, 110, 121, 88, 165, 80, 135, 84, 133, 76, 171, 152, 209]

cp's OEIS Frontend

A366909 Lexicographically earliest infinite sequence of distinct positive integers such that, for n > 2, a(n) shares a factor with a(n-1) but not with n.

Table of values

List of values

n	a(n)
1	1
2	5
3	10
4	15
5	21
6	35
7	20
8	25
9	55
10	33
11	30
12	65
13	40
14	85
15	17
16	51
17	39
18	13
19	26
20	91
21	52
22	117
23	42
24	7
25	14
26	49
27	70
28	45
29	57
30	19
31	38
32	95
33	50
34	75
35	66
36	11
37	22
38	77
39	28
40	63
41	60
42	115
43	23
44	69
45	161
46	105
47	56
48	119
49	34
50	187
51	44
52	99
53	78
54	143
55	104
56	169
57	130
58	125
59	110
60	121
61	88
62	165
63	80
64	135
65	84
66	133
67	76
68	171
69	152
70	209

n	a(n)
1	1
2	5
3	10
4	15
5	21
6	35
7	20
8	25
9	55
10	33
11	30
12	65
13	40
14	85
15	17
16	51
17	39
18	13
19	26
20	91
21	52
22	117
23	42
24	7
25	14
26	49
27	70
28	45
29	57
30	19
31	38
32	95
33	50
34	75
35	66
36	11
37	22
38	77
39	28
40	63
41	60
42	115
43	23
44	69
45	161
46	105
47	56
48	119
49	34
50	187
51	44
52	99
53	78
54	143
55	104
56	169
57	130
58	125
59	110
60	121
61	88
62	165
63	80
64	135
65	84
66	133
67	76
68	171
69	152
70	209

n	a(n)
1	1
2	5
3	10
4	15
5	21
6	35
7	20
8	25
9	55
10	33
11	30
12	65
13	40
14	85
15	17
16	51
17	39
18	13
19	26
20	91
21	52
22	117
23	42
24	7
25	14
26	49
27	70
28	45
29	57
30	19
31	38
32	95
33	50
34	75
35	66
36	11
37	22
38	77
39	28
40	63
41	60
42	115
43	23
44	69
45	161
46	105
47	56
48	119
49	34
50	187
51	44
52	99
53	78
54	143
55	104
56	169
57	130
58	125
59	110
60	121
61	88
62	165
63	80
64	135
65	84
66	133
67	76
68	171
69	152
70	209