A243911 - cp's OEIS frontend

A243911 Least number k such that n^k ends in two identical digits, or 0 if no such number exists.

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

[18, 0, 9, 0, 0, 0, 6, 0, 2, 1, 2, 17, 3, 0, 0, 11, 0, 5, 2, 0, 1, 0, 0, 0, 0, 0, 14, 0, 2, 7, 0, 1, 7, 0, 0, 7, 2, 5, 2, 0, 3, 0, 1, 0, 0, 0, 9, 0, 2, 0, 18, 3, 9, 1, 0, 0, 6, 5, 2, 0, 2, 0, 3, 0, 1, 0, 0, 0, 2, 3, 7, 11, 0, 0, 0, 1, 14, 5, 2, 0, 0, 0, 7, 0, 0, 0, 1, 0, 2, 9, 3, 0, 11]

cp's OEIS Frontend

A243911 Least number k such that n^k ends in two identical digits, or 0 if no such number exists.

Table of values

List of values

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

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

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