A380434 - cp's OEIS frontend

A380434 Lexicographically earliest sequence of distinct positive integers such that for any n > 0, the initial digit of n divides a(n) or the initial digit of a(n) divides n.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	14
15	15
16	16
17	17
18	18
19	19
20	20
21	22
22	21
23	24
24	23
25	26
26	25
27	28
28	27
29	30
30	29
31	33
32	36
33	31
34	39
35	42
36	32
37	45
38	48
39	34
40	40
41	44
42	35
43	52
44	41
45	37
46	56
47	60
48	38
49	64
50	50
51	55
52	43
53	65
54	61
55	51
56	46
57	70
58	75
59	80
60	47
61	54
62	66
63	71
64	49
65	53
66	62
67	72

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 21, 24, 23, 26, 25, 28, 27, 30, 29, 33, 36, 31, 39, 42, 32, 45, 48, 34, 40, 44, 35, 52, 41, 37, 56, 60, 38, 64, 50, 55, 43, 65, 61, 51, 46, 70, 75, 80, 47, 54, 66, 71, 49, 53, 62, 72]

cp's OEIS Frontend

A380434 Lexicographically earliest sequence of distinct positive integers such that for any n > 0, the initial digit of n divides a(n) or the initial digit of a(n) divides n.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	14
15	15
16	16
17	17
18	18
19	19
20	20
21	22
22	21
23	24
24	23
25	26
26	25
27	28
28	27
29	30
30	29
31	33
32	36
33	31
34	39
35	42
36	32
37	45
38	48
39	34
40	40
41	44
42	35
43	52
44	41
45	37
46	56
47	60
48	38
49	64
50	50
51	55
52	43
53	65
54	61
55	51
56	46
57	70
58	75
59	80
60	47
61	54
62	66
63	71
64	49
65	53
66	62
67	72

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	14
15	15
16	16
17	17
18	18
19	19
20	20
21	22
22	21
23	24
24	23
25	26
26	25
27	28
28	27
29	30
30	29
31	33
32	36
33	31
34	39
35	42
36	32
37	45
38	48
39	34
40	40
41	44
42	35
43	52
44	41
45	37
46	56
47	60
48	38
49	64
50	50
51	55
52	43
53	65
54	61
55	51
56	46
57	70
58	75
59	80
60	47
61	54
62	66
63	71
64	49
65	53
66	62
67	72

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	10
11	11
12	12
13	13
14	14
15	15
16	16
17	17
18	18
19	19
20	20
21	22
22	21
23	24
24	23
25	26
26	25
27	28
28	27
29	30
30	29
31	33
32	36
33	31
34	39
35	42
36	32
37	45
38	48
39	34
40	40
41	44
42	35
43	52
44	41
45	37
46	56
47	60
48	38
49	64
50	50
51	55
52	43
53	65
54	61
55	51
56	46
57	70
58	75
59	80
60	47
61	54
62	66
63	71
64	49
65	53
66	62
67	72