A216568 - cp's OEIS frontend

A216568 Smallest k such that prime(n)*k-1 is prime.

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

[2, 1, 4, 2, 4, 8, 4, 2, 6, 6, 2, 2, 4, 6, 6, 4, 6, 8, 6, 4, 14, 2, 4, 16, 2, 10, 6, 6, 6, 6, 6, 4, 4, 2, 10, 12, 2, 6, 10, 4, 10, 8, 22, 8, 4, 2, 2, 8, 4, 2, 16, 6, 14, 12, 12, 4, 6, 2, 12, 4, 6, 4, 2, 10, 6, 6, 2, 2, 6, 8, 10, 6, 2, 6, 2, 4, 6, 6, 22]

cp's OEIS Frontend

A216568 Smallest k such that prime(n)*k-1 is prime.

Table of values

List of values

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

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

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