A355061 - cp's OEIS frontend

A355061 Lexicographically earliest infinite sequence of positive numbers such that, for n>2, a(n) has a common factor with a(n-1), no common factor with a(n-2), and the product a(n)a(n-1) is distinct from all previous products, a(i)a(i-1), i=2..n-1.

n	a(n)
1	1
2	2
3	6
4	15
5	35
6	14
7	6
8	33
9	55
10	10
11	6
12	21
13	35
14	10
15	12
16	21
17	77
18	22
19	6
20	39
21	65
22	10
23	14
24	21
25	15
26	10
27	22
28	33
29	15
30	20
31	14
32	63
33	15
34	40
35	14
36	77
37	33
38	12
39	14
40	91
41	39
42	12
43	20
44	35
45	63
46	6
47	26
48	65
49	15
50	12
51	22
52	55
53	15
54	18
55	28
56	35
57	45
58	12
59	26
60	91
61	21
62	30
63	22
64	143
65	39
66	15
67	50
68	22
69	99
70	15
71	70
72	22
73	187
74	51
75	6

[1, 2, 6, 15, 35, 14, 6, 33, 55, 10, 6, 21, 35, 10, 12, 21, 77, 22, 6, 39, 65, 10, 14, 21, 15, 10, 22, 33, 15, 20, 14, 63, 15, 40, 14, 77, 33, 12, 14, 91, 39, 12, 20, 35, 63, 6, 26, 65, 15, 12, 22, 55, 15, 18, 28, 35, 45, 12, 26, 91, 21, 30, 22, 143, 39, 15, 50, 22, 99, 15, 70, 22, 187, 51, 6]

cp's OEIS Frontend

A355061 Lexicographically earliest infinite sequence of positive numbers such that, for n>2, a(n) has a common factor with a(n-1), no common factor with a(n-2), and the product a(n)a(n-1) is distinct from all previous products, a(i)a(i-1), i=2..n-1.

Table of values

List of values

n	a(n)
1	1
2	2
3	6
4	15
5	35
6	14
7	6
8	33
9	55
10	10
11	6
12	21
13	35
14	10
15	12
16	21
17	77
18	22
19	6
20	39
21	65
22	10
23	14
24	21
25	15
26	10
27	22
28	33
29	15
30	20
31	14
32	63
33	15
34	40
35	14
36	77
37	33
38	12
39	14
40	91
41	39
42	12
43	20
44	35
45	63
46	6
47	26
48	65
49	15
50	12
51	22
52	55
53	15
54	18
55	28
56	35
57	45
58	12
59	26
60	91
61	21
62	30
63	22
64	143
65	39
66	15
67	50
68	22
69	99
70	15
71	70
72	22
73	187
74	51
75	6

n	a(n)
1	1
2	2
3	6
4	15
5	35
6	14
7	6
8	33
9	55
10	10
11	6
12	21
13	35
14	10
15	12
16	21
17	77
18	22
19	6
20	39
21	65
22	10
23	14
24	21
25	15
26	10
27	22
28	33
29	15
30	20
31	14
32	63
33	15
34	40
35	14
36	77
37	33
38	12
39	14
40	91
41	39
42	12
43	20
44	35
45	63
46	6
47	26
48	65
49	15
50	12
51	22
52	55
53	15
54	18
55	28
56	35
57	45
58	12
59	26
60	91
61	21
62	30
63	22
64	143
65	39
66	15
67	50
68	22
69	99
70	15
71	70
72	22
73	187
74	51
75	6

cp's OEIS Frontend

A355061 Lexicographically earliest infinite sequence of positive numbers such that, for n>2, a(n) has a common factor with a(n-1), no common factor with a(n-2), and the product a(n)*a(n-1) is distinct from all previous products, a(i)*a(i-1), i=2..n-1.

Table of values

List of values

A355061 Lexicographically earliest infinite sequence of positive numbers such that, for n>2, a(n) has a common factor with a(n-1), no common factor with a(n-2), and the product a(n)a(n-1) is distinct from all previous products, a(i)a(i-1), i=2..n-1.

n	a(n)
1	1
2	2
3	6
4	15
5	35
6	14
7	6
8	33
9	55
10	10
11	6
12	21
13	35
14	10
15	12
16	21
17	77
18	22
19	6
20	39
21	65
22	10
23	14
24	21
25	15
26	10
27	22
28	33
29	15
30	20
31	14
32	63
33	15
34	40
35	14
36	77
37	33
38	12
39	14
40	91
41	39
42	12
43	20
44	35
45	63
46	6
47	26
48	65
49	15
50	12
51	22
52	55
53	15
54	18
55	28
56	35
57	45
58	12
59	26
60	91
61	21
62	30
63	22
64	143
65	39
66	15
67	50
68	22
69	99
70	15
71	70
72	22
73	187
74	51
75	6