A086686 - cp's OEIS frontend

A086686 Number of 1<=i such that i*n-1 is prime.

n	a(n)
1	0
2	1
3	2
4	3
5	1
6	5
7	2
8	4
9	3
10	5
11	2
12	8
13	1
14	7
15	5
16	7
17	3
18	10
19	4
20	9
21	6
22	10
23	3
24	13
25	6
26	8
27	7
28	11
29	5
30	19
31	6
32	9
33	7
34	9
35	6
36	18
37	5
38	13
39	9
40	16
41	5
42	22
43	7
44	16
45	13
46	12
47	9
48	19
49	7
50	16
51	11
52	15
53	8
54	21
55	12
56	16
57	14
58	14
59	6
60	33
61	8
62	18
63	14
64	15
65	10
66	27
67	10
68	21
69	13
70	29
71	10
72	29
73	3
74	18
75	19

[0, 1, 2, 3, 1, 5, 2, 4, 3, 5, 2, 8, 1, 7, 5, 7, 3, 10, 4, 9, 6, 10, 3, 13, 6, 8, 7, 11, 5, 19, 6, 9, 7, 9, 6, 18, 5, 13, 9, 16, 5, 22, 7, 16, 13, 12, 9, 19, 7, 16, 11, 15, 8, 21, 12, 16, 14, 14, 6, 33, 8, 18, 14, 15, 10, 27, 10, 21, 13, 29, 10, 29, 3, 18, 19]

cp's OEIS Frontend

A086686 Number of 1<=i such that i*n-1 is prime.

Table of values

List of values

n	a(n)
1	0
2	1
3	2
4	3
5	1
6	5
7	2
8	4
9	3
10	5
11	2
12	8
13	1
14	7
15	5
16	7
17	3
18	10
19	4
20	9
21	6
22	10
23	3
24	13
25	6
26	8
27	7
28	11
29	5
30	19
31	6
32	9
33	7
34	9
35	6
36	18
37	5
38	13
39	9
40	16
41	5
42	22
43	7
44	16
45	13
46	12
47	9
48	19
49	7
50	16
51	11
52	15
53	8
54	21
55	12
56	16
57	14
58	14
59	6
60	33
61	8
62	18
63	14
64	15
65	10
66	27
67	10
68	21
69	13
70	29
71	10
72	29
73	3
74	18
75	19

n	a(n)
1	0
2	1
3	2
4	3
5	1
6	5
7	2
8	4
9	3
10	5
11	2
12	8
13	1
14	7
15	5
16	7
17	3
18	10
19	4
20	9
21	6
22	10
23	3
24	13
25	6
26	8
27	7
28	11
29	5
30	19
31	6
32	9
33	7
34	9
35	6
36	18
37	5
38	13
39	9
40	16
41	5
42	22
43	7
44	16
45	13
46	12
47	9
48	19
49	7
50	16
51	11
52	15
53	8
54	21
55	12
56	16
57	14
58	14
59	6
60	33
61	8
62	18
63	14
64	15
65	10
66	27
67	10
68	21
69	13
70	29
71	10
72	29
73	3
74	18
75	19

n	a(n)
1	0
2	1
3	2
4	3
5	1
6	5
7	2
8	4
9	3
10	5
11	2
12	8
13	1
14	7
15	5
16	7
17	3
18	10
19	4
20	9
21	6
22	10
23	3
24	13
25	6
26	8
27	7
28	11
29	5
30	19
31	6
32	9
33	7
34	9
35	6
36	18
37	5
38	13
39	9
40	16
41	5
42	22
43	7
44	16
45	13
46	12
47	9
48	19
49	7
50	16
51	11
52	15
53	8
54	21
55	12
56	16
57	14
58	14
59	6
60	33
61	8
62	18
63	14
64	15
65	10
66	27
67	10
68	21
69	13
70	29
71	10
72	29
73	3
74	18
75	19