A086981 - cp's OEIS frontend

A086981 a(n) = smallest k where (10^k+1)=0 mod prime(n)^2, or 0 if no such k exists.

n	a(n)
1	0
2	0
3	0
4	21
5	11
6	39
7	136
8	171
9	253
10	406
11	0
12	0
13	0
14	0
15	1081
16	0
17	1711
18	1830
19	0
20	0
21	292
22	0
23	0
24	1958
25	4656
26	202
27	1751
28	0
29	5886
30	6328
31	2667
32	8515
33	548
34	3197
35	11026
36	0
37	6123
38	0
39	13861
40	0
41	15931
42	16290
43	0
44	18528
45	9653
46	0
47	3165
48	24753
49	0
50	26106
51	27028
52	0
53	3615
54	6275

[0, 0, 0, 21, 11, 39, 136, 171, 253, 406, 0, 0, 0, 0, 1081, 0, 1711, 1830, 0, 0, 292, 0, 0, 1958, 4656, 202, 1751, 0, 5886, 6328, 2667, 8515, 548, 3197, 11026, 0, 6123, 0, 13861, 0, 15931, 16290, 0, 18528, 9653, 0, 3165, 24753, 0, 26106, 27028, 0, 3615, 6275]

cp's OEIS Frontend

A086981 a(n) = smallest k where (10^k+1)=0 mod prime(n)^2, or 0 if no such k exists.

Table of values

List of values