A259085 - cp's OEIS frontend

A259085 a(n) = largest k such that the decimal representation of prime(n)^k does not contain the digit 1, or -1 if no such k exists.

n	a(n)
1	91
2	43
3	42
4	30
5	-1
6	14
7	13
8	23
9	7
10	3
11	-1
12	6
13	-1
14	3
15	5
16	2
17	19
18	-1
19	9
20	-1
21	17
22	5
23	6
24	9
25	6
26	-1
27	-1
28	-1
29	11
30	-1
31	13
32	-1
33	7
34	-1
35	5
36	-1
37	5
38	3
39	13
40	6
41	7
42	-1
43	-1
44	7
45	10
46	15
47	-1
48	2
49	5
50	7
51	2
52	9
53	-1
54	-1
55	2
56	6
57	1
58	-1
59	2
60	-1
61	21
62	2
63	3
64	-1
65	3
66	11
67	-1
68	5
69	11
70	3
71	3
72	3
73	5
74	1

[91, 43, 42, 30, -1, 14, 13, 23, 7, 3, -1, 6, -1, 3, 5, 2, 19, -1, 9, -1, 17, 5, 6, 9, 6, -1, -1, -1, 11, -1, 13, -1, 7, -1, 5, -1, 5, 3, 13, 6, 7, -1, -1, 7, 10, 15, -1, 2, 5, 7, 2, 9, -1, -1, 2, 6, 1, -1, 2, -1, 21, 2, 3, -1, 3, 11, -1, 5, 11, 3, 3, 3, 5, 1]

cp's OEIS Frontend

A259085 a(n) = largest k such that the decimal representation of prime(n)^k does not contain the digit 1, or -1 if no such k exists.

Table of values

List of values

n	a(n)
1	91
2	43
3	42
4	30
5	-1
6	14
7	13
8	23
9	7
10	3
11	-1
12	6
13	-1
14	3
15	5
16	2
17	19
18	-1
19	9
20	-1
21	17
22	5
23	6
24	9
25	6
26	-1
27	-1
28	-1
29	11
30	-1
31	13
32	-1
33	7
34	-1
35	5
36	-1
37	5
38	3
39	13
40	6
41	7
42	-1
43	-1
44	7
45	10
46	15
47	-1
48	2
49	5
50	7
51	2
52	9
53	-1
54	-1
55	2
56	6
57	1
58	-1
59	2
60	-1
61	21
62	2
63	3
64	-1
65	3
66	11
67	-1
68	5
69	11
70	3
71	3
72	3
73	5
74	1

n	a(n)
1	91
2	43
3	42
4	30
5	-1
6	14
7	13
8	23
9	7
10	3
11	-1
12	6
13	-1
14	3
15	5
16	2
17	19
18	-1
19	9
20	-1
21	17
22	5
23	6
24	9
25	6
26	-1
27	-1
28	-1
29	11
30	-1
31	13
32	-1
33	7
34	-1
35	5
36	-1
37	5
38	3
39	13
40	6
41	7
42	-1
43	-1
44	7
45	10
46	15
47	-1
48	2
49	5
50	7
51	2
52	9
53	-1
54	-1
55	2
56	6
57	1
58	-1
59	2
60	-1
61	21
62	2
63	3
64	-1
65	3
66	11
67	-1
68	5
69	11
70	3
71	3
72	3
73	5
74	1

n	a(n)
1	91
2	43
3	42
4	30
5	-1
6	14
7	13
8	23
9	7
10	3
11	-1
12	6
13	-1
14	3
15	5
16	2
17	19
18	-1
19	9
20	-1
21	17
22	5
23	6
24	9
25	6
26	-1
27	-1
28	-1
29	11
30	-1
31	13
32	-1
33	7
34	-1
35	5
36	-1
37	5
38	3
39	13
40	6
41	7
42	-1
43	-1
44	7
45	10
46	15
47	-1
48	2
49	5
50	7
51	2
52	9
53	-1
54	-1
55	2
56	6
57	1
58	-1
59	2
60	-1
61	21
62	2
63	3
64	-1
65	3
66	11
67	-1
68	5
69	11
70	3
71	3
72	3
73	5
74	1