A217157 - cp's OEIS frontend

A217157 a(n) is the least value of k such that the decimal expansion of n^k contains two consecutive identical digits.

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

[16, 11, 8, 11, 5, 6, 6, 6, 2, 1, 2, 9, 3, 2, 4, 7, 5, 5, 2, 2, 1, 6, 4, 6, 5, 4, 8, 5, 2, 6, 5, 1, 2, 2, 3, 7, 2, 4, 2, 5, 3, 4, 1, 3, 2, 2, 3, 3, 2, 7, 4, 3, 6, 1, 4, 4, 2, 4, 2, 3, 2, 3, 3, 2, 1, 2, 3, 4, 2, 3, 7, 6, 3, 6, 2, 1, 3, 4, 2, 3, 3, 2, 5, 2, 4, 6]

cp's OEIS Frontend

A217157 a(n) is the least value of k such that the decimal expansion of n^k contains two consecutive identical digits.

Table of values

List of values

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

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

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