A068958 - cp's OEIS frontend

A068958 Smallest value of k such that p | (10^k + 1), where p is the n-th prime; or 0 if no such k exists.

n	a(n)
4	3
5	1
6	3
7	8
8	9
9	11
10	14
11	0
12	0
13	0
14	0
15	23
16	0
17	29
18	30
19	0
20	0
21	4
22	0
23	0
24	22
25	48
26	2
27	17
28	0
29	54
30	56
31	21
32	65
33	4
34	23
35	74
36	0
37	39
38	0
39	83
40	0
41	89
42	90
43	0
44	96
45	49
46	0
47	15
48	111
49	0
50	114
51	116
52	0
53	15
54	25
55	128
56	131
57	134
58	0
59	0
60	14
61	0
62	73
63	0
64	0
65	156
66	0
67	55
68	168
69	0
70	58
71	16
72	0
73	183
74	93
75	189
76	191
77	194
78	0
79	100

[3, 1, 3, 8, 9, 11, 14, 0, 0, 0, 0, 23, 0, 29, 30, 0, 0, 4, 0, 0, 22, 48, 2, 17, 0, 54, 56, 21, 65, 4, 23, 74, 0, 39, 0, 83, 0, 89, 90, 0, 96, 49, 0, 15, 111, 0, 114, 116, 0, 15, 25, 128, 131, 134, 0, 0, 14, 0, 73, 0, 0, 156, 0, 55, 168, 0, 58, 16, 0, 183, 93, 189, 191, 194, 0, 100]

cp's OEIS Frontend

A068958 Smallest value of k such that p | (10^k + 1), where p is the n-th prime; or 0 if no such k exists.

Table of values

List of values

n	a(n)
4	3
5	1
6	3
7	8
8	9
9	11
10	14
11	0
12	0
13	0
14	0
15	23
16	0
17	29
18	30
19	0
20	0
21	4
22	0
23	0
24	22
25	48
26	2
27	17
28	0
29	54
30	56
31	21
32	65
33	4
34	23
35	74
36	0
37	39
38	0
39	83
40	0
41	89
42	90
43	0
44	96
45	49
46	0
47	15
48	111
49	0
50	114
51	116
52	0
53	15
54	25
55	128
56	131
57	134
58	0
59	0
60	14
61	0
62	73
63	0
64	0
65	156
66	0
67	55
68	168
69	0
70	58
71	16
72	0
73	183
74	93
75	189
76	191
77	194
78	0
79	100

n	a(n)
4	3
5	1
6	3
7	8
8	9
9	11
10	14
11	0
12	0
13	0
14	0
15	23
16	0
17	29
18	30
19	0
20	0
21	4
22	0
23	0
24	22
25	48
26	2
27	17
28	0
29	54
30	56
31	21
32	65
33	4
34	23
35	74
36	0
37	39
38	0
39	83
40	0
41	89
42	90
43	0
44	96
45	49
46	0
47	15
48	111
49	0
50	114
51	116
52	0
53	15
54	25
55	128
56	131
57	134
58	0
59	0
60	14
61	0
62	73
63	0
64	0
65	156
66	0
67	55
68	168
69	0
70	58
71	16
72	0
73	183
74	93
75	189
76	191
77	194
78	0
79	100

n	a(n)
4	3
5	1
6	3
7	8
8	9
9	11
10	14
11	0
12	0
13	0
14	0
15	23
16	0
17	29
18	30
19	0
20	0
21	4
22	0
23	0
24	22
25	48
26	2
27	17
28	0
29	54
30	56
31	21
32	65
33	4
34	23
35	74
36	0
37	39
38	0
39	83
40	0
41	89
42	90
43	0
44	96
45	49
46	0
47	15
48	111
49	0
50	114
51	116
52	0
53	15
54	25
55	128
56	131
57	134
58	0
59	0
60	14
61	0
62	73
63	0
64	0
65	156
66	0
67	55
68	168
69	0
70	58
71	16
72	0
73	183
74	93
75	189
76	191
77	194
78	0
79	100