A330647 - cp's OEIS frontend

A330647 Lexicographically earliest sequence of distinct positive terms with an associate sequence t such that a(1) = t(1) = 1 and for n > 1, either a(n) divides t(n-1) (and in that case set t(n) = t(n-1)/a(n)) or a(n) is coprime to t(n-1) (and in that case set t(n) = t(n-1)*a(n)).

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

[1, 2, 3, 5, 6, 4, 7, 9, 10, 11, 13, 14, 8, 12, 17, 19, 22, 16, 23, 24, 15, 26, 28, 20, 21, 18, 25, 29, 30, 31, 32, 34, 37, 38, 40, 35, 41, 43, 44, 33, 27, 36, 47, 52, 39, 46, 51, 42, 48, 49, 53, 56, 58, 59, 61, 64, 60, 45, 62, 63, 57, 67, 68, 71, 73, 74, 77]

cp's OEIS Frontend

A330647 Lexicographically earliest sequence of distinct positive terms with an associate sequence t such that a(1) = t(1) = 1 and for n > 1, either a(n) divides t(n-1) (and in that case set t(n) = t(n-1)/a(n)) or a(n) is coprime to t(n-1) (and in that case set t(n) = t(n-1)*a(n)).

Table of values

List of values

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

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

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