A216473 - cp's OEIS frontend

A216473 a(n) = smallest m such that 2n-1 | (10^m-1)/9, or 0 if no such m exists.

n	a(n)
1	1
2	3
3	0
4	6
5	9
6	2
7	6
8	0
9	16
10	18
11	6
12	22
13	0
14	27
15	28
16	15
17	6
18	0
19	3
20	6
21	5
22	21
23	0
24	46
25	42
26	48
27	13
28	0
29	18
30	58
31	60
32	18
33	0
34	33
35	66
36	35
37	8
38	0
39	6
40	13
41	81
42	41
43	0
44	84
45	44
46	6
47	15
48	0
49	96
50	18
51	4
52	34
53	0
54	53
55	108
56	3
57	112
58	0
59	18
60	48
61	22
62	15
63	0
64	42
65	21
66	130
67	18
68	0
69	8
70	46
71	138
72	6
73	0

[1, 3, 0, 6, 9, 2, 6, 0, 16, 18, 6, 22, 0, 27, 28, 15, 6, 0, 3, 6, 5, 21, 0, 46, 42, 48, 13, 0, 18, 58, 60, 18, 0, 33, 66, 35, 8, 0, 6, 13, 81, 41, 0, 84, 44, 6, 15, 0, 96, 18, 4, 34, 0, 53, 108, 3, 112, 0, 18, 48, 22, 15, 0, 42, 21, 130, 18, 0, 8, 46, 138, 6, 0]

cp's OEIS Frontend

A216473 a(n) = smallest m such that 2n-1 | (10^m-1)/9, or 0 if no such m exists.

Table of values

List of values

n	a(n)
1	1
2	3
3	0
4	6
5	9
6	2
7	6
8	0
9	16
10	18
11	6
12	22
13	0
14	27
15	28
16	15
17	6
18	0
19	3
20	6
21	5
22	21
23	0
24	46
25	42
26	48
27	13
28	0
29	18
30	58
31	60
32	18
33	0
34	33
35	66
36	35
37	8
38	0
39	6
40	13
41	81
42	41
43	0
44	84
45	44
46	6
47	15
48	0
49	96
50	18
51	4
52	34
53	0
54	53
55	108
56	3
57	112
58	0
59	18
60	48
61	22
62	15
63	0
64	42
65	21
66	130
67	18
68	0
69	8
70	46
71	138
72	6
73	0

n	a(n)
1	1
2	3
3	0
4	6
5	9
6	2
7	6
8	0
9	16
10	18
11	6
12	22
13	0
14	27
15	28
16	15
17	6
18	0
19	3
20	6
21	5
22	21
23	0
24	46
25	42
26	48
27	13
28	0
29	18
30	58
31	60
32	18
33	0
34	33
35	66
36	35
37	8
38	0
39	6
40	13
41	81
42	41
43	0
44	84
45	44
46	6
47	15
48	0
49	96
50	18
51	4
52	34
53	0
54	53
55	108
56	3
57	112
58	0
59	18
60	48
61	22
62	15
63	0
64	42
65	21
66	130
67	18
68	0
69	8
70	46
71	138
72	6
73	0

n	a(n)
1	1
2	3
3	0
4	6
5	9
6	2
7	6
8	0
9	16
10	18
11	6
12	22
13	0
14	27
15	28
16	15
17	6
18	0
19	3
20	6
21	5
22	21
23	0
24	46
25	42
26	48
27	13
28	0
29	18
30	58
31	60
32	18
33	0
34	33
35	66
36	35
37	8
38	0
39	6
40	13
41	81
42	41
43	0
44	84
45	44
46	6
47	15
48	0
49	96
50	18
51	4
52	34
53	0
54	53
55	108
56	3
57	112
58	0
59	18
60	48
61	22
62	15
63	0
64	42
65	21
66	130
67	18
68	0
69	8
70	46
71	138
72	6
73	0