A308539 - cp's OEIS frontend

A308539 Lexicographically earliest sequence of distinct positive terms such that for any n > 0, the initial digit of a(n) divides a(n+1).

n	a(n)
1	1
2	2
3	4
4	8
5	16
6	3
7	6
8	12
9	5
10	10
11	7
12	14
13	9
14	18
15	11
16	13
17	15
18	17
19	19
20	20
21	22
22	24
23	26
24	28
25	30
26	21
27	32
28	27
29	34
30	33
31	36
32	39
33	42
34	40
35	44
36	48
37	52
38	25
39	38
40	45
41	56
42	35
43	51
44	50
45	55
46	60
47	54
48	65
49	66
50	72
51	49
52	64
53	78
54	63
55	84
56	80
57	88
58	96
59	81
60	104
61	23
62	46
63	68
64	90
65	99
66	108
67	29

[1, 2, 4, 8, 16, 3, 6, 12, 5, 10, 7, 14, 9, 18, 11, 13, 15, 17, 19, 20, 22, 24, 26, 28, 30, 21, 32, 27, 34, 33, 36, 39, 42, 40, 44, 48, 52, 25, 38, 45, 56, 35, 51, 50, 55, 60, 54, 65, 66, 72, 49, 64, 78, 63, 84, 80, 88, 96, 81, 104, 23, 46, 68, 90, 99, 108, 29]

cp's OEIS Frontend

A308539 Lexicographically earliest sequence of distinct positive terms such that for any n > 0, the initial digit of a(n) divides a(n+1).

Table of values

List of values

n	a(n)
1	1
2	2
3	4
4	8
5	16
6	3
7	6
8	12
9	5
10	10
11	7
12	14
13	9
14	18
15	11
16	13
17	15
18	17
19	19
20	20
21	22
22	24
23	26
24	28
25	30
26	21
27	32
28	27
29	34
30	33
31	36
32	39
33	42
34	40
35	44
36	48
37	52
38	25
39	38
40	45
41	56
42	35
43	51
44	50
45	55
46	60
47	54
48	65
49	66
50	72
51	49
52	64
53	78
54	63
55	84
56	80
57	88
58	96
59	81
60	104
61	23
62	46
63	68
64	90
65	99
66	108
67	29

n	a(n)
1	1
2	2
3	4
4	8
5	16
6	3
7	6
8	12
9	5
10	10
11	7
12	14
13	9
14	18
15	11
16	13
17	15
18	17
19	19
20	20
21	22
22	24
23	26
24	28
25	30
26	21
27	32
28	27
29	34
30	33
31	36
32	39
33	42
34	40
35	44
36	48
37	52
38	25
39	38
40	45
41	56
42	35
43	51
44	50
45	55
46	60
47	54
48	65
49	66
50	72
51	49
52	64
53	78
54	63
55	84
56	80
57	88
58	96
59	81
60	104
61	23
62	46
63	68
64	90
65	99
66	108
67	29

n	a(n)
1	1
2	2
3	4
4	8
5	16
6	3
7	6
8	12
9	5
10	10
11	7
12	14
13	9
14	18
15	11
16	13
17	15
18	17
19	19
20	20
21	22
22	24
23	26
24	28
25	30
26	21
27	32
28	27
29	34
30	33
31	36
32	39
33	42
34	40
35	44
36	48
37	52
38	25
39	38
40	45
41	56
42	35
43	51
44	50
45	55
46	60
47	54
48	65
49	66
50	72
51	49
52	64
53	78
54	63
55	84
56	80
57	88
58	96
59	81
60	104
61	23
62	46
63	68
64	90
65	99
66	108
67	29