A085064 - cp's OEIS frontend

A085064 a(n) = smallest k such that nk-1 as well as n+k are primes.

n	a(n)
1	4
2	3
3	2
4	1
5	6
6	1
7	6
8	3
9	2
10	3
11	12
12	1
13	18
14	3
15	2
16	3
17	6
18	1
19	12
20	3
21	2
22	9
23	6
24	7
25	6
26	15
27	2
28	3
29	12
30	1
31	30
32	15
33	4
34	3
35	12
36	5
37	24
38	3
39	8
40	21
41	12
42	1
43	18
44	3
45	2
46	57
47	6
48	5
49	12
50	3
51	2
52	9
53	6
54	5
55	12
56	3
57	2
58	3
59	42
60	1
61	18
62	9
63	4
64	3
65	6
66	7
67	6
68	15
69	2
70	27
71	18
72	1
73	66
74	15
75	8
76	3
77	6
78	5
79	120
80	3
81	8
82	15
83	18
84	5
85	12
86	3
87	2
88	15
89	18

[4, 3, 2, 1, 6, 1, 6, 3, 2, 3, 12, 1, 18, 3, 2, 3, 6, 1, 12, 3, 2, 9, 6, 7, 6, 15, 2, 3, 12, 1, 30, 15, 4, 3, 12, 5, 24, 3, 8, 21, 12, 1, 18, 3, 2, 57, 6, 5, 12, 3, 2, 9, 6, 5, 12, 3, 2, 3, 42, 1, 18, 9, 4, 3, 6, 7, 6, 15, 2, 27, 18, 1, 66, 15, 8, 3, 6, 5, 120, 3, 8, 15, 18, 5, 12, 3, 2, 15, 18]

cp's OEIS Frontend

A085064 a(n) = smallest k such that nk-1 as well as n+k are primes.

Table of values

List of values

n	a(n)
1	4
2	3
3	2
4	1
5	6
6	1
7	6
8	3
9	2
10	3
11	12
12	1
13	18
14	3
15	2
16	3
17	6
18	1
19	12
20	3
21	2
22	9
23	6
24	7
25	6
26	15
27	2
28	3
29	12
30	1
31	30
32	15
33	4
34	3
35	12
36	5
37	24
38	3
39	8
40	21
41	12
42	1
43	18
44	3
45	2
46	57
47	6
48	5
49	12
50	3
51	2
52	9
53	6
54	5
55	12
56	3
57	2
58	3
59	42
60	1
61	18
62	9
63	4
64	3
65	6
66	7
67	6
68	15
69	2
70	27
71	18
72	1
73	66
74	15
75	8
76	3
77	6
78	5
79	120
80	3
81	8
82	15
83	18
84	5
85	12
86	3
87	2
88	15
89	18

n	a(n)
1	4
2	3
3	2
4	1
5	6
6	1
7	6
8	3
9	2
10	3
11	12
12	1
13	18
14	3
15	2
16	3
17	6
18	1
19	12
20	3
21	2
22	9
23	6
24	7
25	6
26	15
27	2
28	3
29	12
30	1
31	30
32	15
33	4
34	3
35	12
36	5
37	24
38	3
39	8
40	21
41	12
42	1
43	18
44	3
45	2
46	57
47	6
48	5
49	12
50	3
51	2
52	9
53	6
54	5
55	12
56	3
57	2
58	3
59	42
60	1
61	18
62	9
63	4
64	3
65	6
66	7
67	6
68	15
69	2
70	27
71	18
72	1
73	66
74	15
75	8
76	3
77	6
78	5
79	120
80	3
81	8
82	15
83	18
84	5
85	12
86	3
87	2
88	15
89	18

n	a(n)
1	4
2	3
3	2
4	1
5	6
6	1
7	6
8	3
9	2
10	3
11	12
12	1
13	18
14	3
15	2
16	3
17	6
18	1
19	12
20	3
21	2
22	9
23	6
24	7
25	6
26	15
27	2
28	3
29	12
30	1
31	30
32	15
33	4
34	3
35	12
36	5
37	24
38	3
39	8
40	21
41	12
42	1
43	18
44	3
45	2
46	57
47	6
48	5
49	12
50	3
51	2
52	9
53	6
54	5
55	12
56	3
57	2
58	3
59	42
60	1
61	18
62	9
63	4
64	3
65	6
66	7
67	6
68	15
69	2
70	27
71	18
72	1
73	66
74	15
75	8
76	3
77	6
78	5
79	120
80	3
81	8
82	15
83	18
84	5
85	12
86	3
87	2
88	15
89	18