A217158 - cp's OEIS frontend

A217158 a(n) is the least value of k such that the decimal expansion of n^k contains three consecutive identical digits.

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

[24, 32, 12, 50, 5, 31, 8, 16, 3, 8, 17, 25, 14, 23, 6, 12, 6, 9, 3, 11, 7, 15, 14, 25, 11, 11, 10, 5, 3, 7, 8, 10, 10, 18, 9, 15, 2, 12, 3, 14, 4, 7, 12, 18, 12, 8, 17, 17, 3, 15, 10, 7, 11, 25, 24, 8, 11, 10, 3, 14, 11, 18, 4, 7, 9, 13, 7, 12, 3, 11, 8, 13]

cp's OEIS Frontend

A217158 a(n) is the least value of k such that the decimal expansion of n^k contains three consecutive identical digits.

Table of values

List of values

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

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

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