A069571 - cp's OEIS frontend

A069571 Numbers n in which the k-th digit (counted from the right) is nonzero and is either a divisor of k (but not 1 in case k has a single-digit prime divisor) or a multiple of k, for all 1 <= k <= number of digits of n.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	21
11	22
12	23
13	24
14	25
15	26
16	27
17	28
18	29
19	41
20	42
21	43
22	44
23	45
24	46
25	47
26	48
27	49
28	61
29	62
30	63
31	64
32	65
33	66
34	67
35	68
36	69
37	81
38	82
39	83
40	84
41	85
42	86
43	87
44	88
45	89
46	321
47	322
48	323
49	324
50	325
51	326
52	327
53	328
54	329
55	341
56	342
57	343
58	344
59	345
60	346
61	347
62	348
63	349
64	361
65	362

[1, 2, 3, 4, 5, 6, 7, 8, 9, 21, 22, 23, 24, 25, 26, 27, 28, 29, 41, 42, 43, 44, 45, 46, 47, 48, 49, 61, 62, 63, 64, 65, 66, 67, 68, 69, 81, 82, 83, 84, 85, 86, 87, 88, 89, 321, 322, 323, 324, 325, 326, 327, 328, 329, 341, 342, 343, 344, 345, 346, 347, 348, 349, 361, 362]

cp's OEIS Frontend

A069571 Numbers n in which the k-th digit (counted from the right) is nonzero and is either a divisor of k (but not 1 in case k has a single-digit prime divisor) or a multiple of k, for all 1 <= k <= number of digits of 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	21
11	22
12	23
13	24
14	25
15	26
16	27
17	28
18	29
19	41
20	42
21	43
22	44
23	45
24	46
25	47
26	48
27	49
28	61
29	62
30	63
31	64
32	65
33	66
34	67
35	68
36	69
37	81
38	82
39	83
40	84
41	85
42	86
43	87
44	88
45	89
46	321
47	322
48	323
49	324
50	325
51	326
52	327
53	328
54	329
55	341
56	342
57	343
58	344
59	345
60	346
61	347
62	348
63	349
64	361
65	362

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	21
11	22
12	23
13	24
14	25
15	26
16	27
17	28
18	29
19	41
20	42
21	43
22	44
23	45
24	46
25	47
26	48
27	49
28	61
29	62
30	63
31	64
32	65
33	66
34	67
35	68
36	69
37	81
38	82
39	83
40	84
41	85
42	86
43	87
44	88
45	89
46	321
47	322
48	323
49	324
50	325
51	326
52	327
53	328
54	329
55	341
56	342
57	343
58	344
59	345
60	346
61	347
62	348
63	349
64	361
65	362

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	9
10	21
11	22
12	23
13	24
14	25
15	26
16	27
17	28
18	29
19	41
20	42
21	43
22	44
23	45
24	46
25	47
26	48
27	49
28	61
29	62
30	63
31	64
32	65
33	66
34	67
35	68
36	69
37	81
38	82
39	83
40	84
41	85
42	86
43	87
44	88
45	89
46	321
47	322
48	323
49	324
50	325
51	326
52	327
53	328
54	329
55	341
56	342
57	343
58	344
59	345
60	346
61	347
62	348
63	349
64	361
65	362