A216415 - cp's OEIS frontend

A216415 a(n) = smallest positive m such that 2n-1 | 10^m-1, or 0 if no such m exists.

n	a(n)
1	1
2	1
3	0
4	6
5	1
6	2
7	6
8	0
9	16
10	18
11	6
12	22
13	0
14	3
15	28
16	15
17	2
18	0
19	3
20	6
21	5
22	21
23	0
24	46
25	42
26	16
27	13
28	0
29	18
30	58
31	60
32	6
33	0
34	33
35	22
36	35
37	8
38	0
39	6
40	13
41	9
42	41
43	0
44	28
45	44
46	6
47	15
48	0
49	96
50	2
51	4
52	34
53	0
54	53
55	108
56	3
57	112
58	0
59	6
60	48
61	22
62	5
63	0
64	42
65	21
66	130
67	18
68	0
69	8
70	46
71	46
72	6
73	0
74	42
75	148
76	75
77	16
78	0
79	78
80	13
81	66
82	81
83	0
84	166
85	78
86	18
87	43
88	0
89	58
90	178
91	180
92	60
93	0
94	16
95	6
96	95
97	192
98	0
99	98
100	99

[1, 1, 0, 6, 1, 2, 6, 0, 16, 18, 6, 22, 0, 3, 28, 15, 2, 0, 3, 6, 5, 21, 0, 46, 42, 16, 13, 0, 18, 58, 60, 6, 0, 33, 22, 35, 8, 0, 6, 13, 9, 41, 0, 28, 44, 6, 15, 0, 96, 2, 4, 34, 0, 53, 108, 3, 112, 0, 6, 48, 22, 5, 0, 42, 21, 130, 18, 0, 8, 46, 46, 6, 0, 42, 148, 75, 16, 0, 78, 13, 66, 81, 0, 166, 78, 18, 43, 0, 58, 178, 180, 60, 0, 16, 6, 95, 192, 0, 98, 99]

cp's OEIS Frontend

A216415 a(n) = smallest positive m such that 2n-1 | 10^m-1, or 0 if no such m exists.

Table of values

List of values

n	a(n)
1	1
2	1
3	0
4	6
5	1
6	2
7	6
8	0
9	16
10	18
11	6
12	22
13	0
14	3
15	28
16	15
17	2
18	0
19	3
20	6
21	5
22	21
23	0
24	46
25	42
26	16
27	13
28	0
29	18
30	58
31	60
32	6
33	0
34	33
35	22
36	35
37	8
38	0
39	6
40	13
41	9
42	41
43	0
44	28
45	44
46	6
47	15
48	0
49	96
50	2
51	4
52	34
53	0
54	53
55	108
56	3
57	112
58	0
59	6
60	48
61	22
62	5
63	0
64	42
65	21
66	130
67	18
68	0
69	8
70	46
71	46
72	6
73	0
74	42
75	148
76	75
77	16
78	0
79	78
80	13
81	66
82	81
83	0
84	166
85	78
86	18
87	43
88	0
89	58
90	178
91	180
92	60
93	0
94	16
95	6
96	95
97	192
98	0
99	98
100	99

n	a(n)
1	1
2	1
3	0
4	6
5	1
6	2
7	6
8	0
9	16
10	18
11	6
12	22
13	0
14	3
15	28
16	15
17	2
18	0
19	3
20	6
21	5
22	21
23	0
24	46
25	42
26	16
27	13
28	0
29	18
30	58
31	60
32	6
33	0
34	33
35	22
36	35
37	8
38	0
39	6
40	13
41	9
42	41
43	0
44	28
45	44
46	6
47	15
48	0
49	96
50	2
51	4
52	34
53	0
54	53
55	108
56	3
57	112
58	0
59	6
60	48
61	22
62	5
63	0
64	42
65	21
66	130
67	18
68	0
69	8
70	46
71	46
72	6
73	0
74	42
75	148
76	75
77	16
78	0
79	78
80	13
81	66
82	81
83	0
84	166
85	78
86	18
87	43
88	0
89	58
90	178
91	180
92	60
93	0
94	16
95	6
96	95
97	192
98	0
99	98
100	99

n	a(n)
1	1
2	1
3	0
4	6
5	1
6	2
7	6
8	0
9	16
10	18
11	6
12	22
13	0
14	3
15	28
16	15
17	2
18	0
19	3
20	6
21	5
22	21
23	0
24	46
25	42
26	16
27	13
28	0
29	18
30	58
31	60
32	6
33	0
34	33
35	22
36	35
37	8
38	0
39	6
40	13
41	9
42	41
43	0
44	28
45	44
46	6
47	15
48	0
49	96
50	2
51	4
52	34
53	0
54	53
55	108
56	3
57	112
58	0
59	6
60	48
61	22
62	5
63	0
64	42
65	21
66	130
67	18
68	0
69	8
70	46
71	46
72	6
73	0
74	42
75	148
76	75
77	16
78	0
79	78
80	13
81	66
82	81
83	0
84	166
85	78
86	18
87	43
88	0
89	58
90	178
91	180
92	60
93	0
94	16
95	6
96	95
97	192
98	0
99	98
100	99