A217179 - cp's OEIS frontend

A217179 a(n) is the number of digits in the decimal representation of the smallest power of n that contains four consecutive identical digits.

n	a(n)
2	13
3	16
4	55
5	67
6	90
7	61
8	55
9	84
10	5
11	41
12	20
13	28
14	17
15	116
16	55
17	64
18	98
19	90
20	6
21	39
22	57
23	48
24	57
25	68
26	63
27	16
28	31
29	55
30	6
31	27
32	55
33	108
34	53
35	28
36	100
37	32
38	62
39	51
40	7
41	65
42	33
43	33
44	74
45	55
46	55
47	24
48	61
49	68
50	7
51	64
52	73
53	51
54	68
55	110
56	42
57	18
58	46
59	18
60	8
61	115
62	27
63	54
64	55
65	33
66	31
67	106

[13, 16, 55, 67, 90, 61, 55, 84, 5, 41, 20, 28, 17, 116, 55, 64, 98, 90, 6, 39, 57, 48, 57, 68, 63, 16, 31, 55, 6, 27, 55, 108, 53, 28, 100, 32, 62, 51, 7, 65, 33, 33, 74, 55, 55, 24, 61, 68, 7, 64, 73, 51, 68, 110, 42, 18, 46, 18, 8, 115, 27, 54, 55, 33, 31, 106]

cp's OEIS Frontend

A217179 a(n) is the number of digits in the decimal representation of the smallest power of n that contains four consecutive identical digits.

Table of values

List of values

n	a(n)
2	13
3	16
4	55
5	67
6	90
7	61
8	55
9	84
10	5
11	41
12	20
13	28
14	17
15	116
16	55
17	64
18	98
19	90
20	6
21	39
22	57
23	48
24	57
25	68
26	63
27	16
28	31
29	55
30	6
31	27
32	55
33	108
34	53
35	28
36	100
37	32
38	62
39	51
40	7
41	65
42	33
43	33
44	74
45	55
46	55
47	24
48	61
49	68
50	7
51	64
52	73
53	51
54	68
55	110
56	42
57	18
58	46
59	18
60	8
61	115
62	27
63	54
64	55
65	33
66	31
67	106

n	a(n)
2	13
3	16
4	55
5	67
6	90
7	61
8	55
9	84
10	5
11	41
12	20
13	28
14	17
15	116
16	55
17	64
18	98
19	90
20	6
21	39
22	57
23	48
24	57
25	68
26	63
27	16
28	31
29	55
30	6
31	27
32	55
33	108
34	53
35	28
36	100
37	32
38	62
39	51
40	7
41	65
42	33
43	33
44	74
45	55
46	55
47	24
48	61
49	68
50	7
51	64
52	73
53	51
54	68
55	110
56	42
57	18
58	46
59	18
60	8
61	115
62	27
63	54
64	55
65	33
66	31
67	106

n	a(n)
2	13
3	16
4	55
5	67
6	90
7	61
8	55
9	84
10	5
11	41
12	20
13	28
14	17
15	116
16	55
17	64
18	98
19	90
20	6
21	39
22	57
23	48
24	57
25	68
26	63
27	16
28	31
29	55
30	6
31	27
32	55
33	108
34	53
35	28
36	100
37	32
38	62
39	51
40	7
41	65
42	33
43	33
44	74
45	55
46	55
47	24
48	61
49	68
50	7
51	64
52	73
53	51
54	68
55	110
56	42
57	18
58	46
59	18
60	8
61	115
62	27
63	54
64	55
65	33
66	31
67	106