A084680 - cp's OEIS frontend

A084680 Order of 10 modulo n [i.e., least m such that 10^m = 1 (mod n)] or 0 when no such number exists.

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

[1, 0, 1, 0, 0, 0, 6, 0, 1, 0, 2, 0, 6, 0, 0, 0, 16, 0, 18, 0, 6, 0, 22, 0, 0, 0, 3, 0, 28, 0, 15, 0, 2, 0, 0, 0, 3, 0, 6, 0, 5, 0, 21, 0, 0, 0, 46, 0, 42, 0, 16, 0, 13, 0, 0, 0, 18, 0, 58, 0, 60, 0, 6, 0, 0, 0, 33, 0, 22, 0, 35, 0, 8, 0, 0, 0, 6, 0, 13, 0, 9, 0, 41, 0, 0, 0, 28, 0, 44, 0, 6, 0, 15, 0, 0, 0]

cp's OEIS Frontend

A084680 Order of 10 modulo n [i.e., least m such that 10^m = 1 (mod n)] or 0 when no such number exists.

Table of values

List of values

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

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

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