A085063 - cp's OEIS frontend

A085063 a(n) is the minimal number k such that n+k and n*k+1 are primes.

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	1
7	4
8	5
9	2
10	1
11	2
12	1
13	4
14	3
15	2
16	1
17	6
18	1
19	10
20	3
21	2
22	1
23	6
24	13
25	4
26	3
27	4
28	1
29	2
30	1
31	10
32	11
33	10
34	3
35	2
36	1
37	4
38	5
39	2
40	1
41	2
42	1
43	4
44	9
45	14
46	1
47	6
48	5
49	4
50	3
51	2
52	1
53	14
54	5
55	6
56	5
57	4
58	1
59	12
60	1
61	6
62	5
63	10
64	3
65	2
66	1
67	4
68	15
69	2
70	1
71	8
72	1
73	6
74	27
75	8
76	3
77	6
78	1
79	4
80	3
81	2
82	1
83	6
84	5
85	12
86	11
87	20
88	1
89	12
90	7
91	6
92	5
93	4
94	3
95	2
96	1
97	4
98	5

[1, 1, 2, 1, 2, 1, 4, 5, 2, 1, 2, 1, 4, 3, 2, 1, 6, 1, 10, 3, 2, 1, 6, 13, 4, 3, 4, 1, 2, 1, 10, 11, 10, 3, 2, 1, 4, 5, 2, 1, 2, 1, 4, 9, 14, 1, 6, 5, 4, 3, 2, 1, 14, 5, 6, 5, 4, 1, 12, 1, 6, 5, 10, 3, 2, 1, 4, 15, 2, 1, 8, 1, 6, 27, 8, 3, 6, 1, 4, 3, 2, 1, 6, 5, 12, 11, 20, 1, 12, 7, 6, 5, 4, 3, 2, 1, 4, 5]

cp's OEIS Frontend

A085063 a(n) is the minimal number k such that n+k and n*k+1 are primes.

Table of values

List of values

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	1
7	4
8	5
9	2
10	1
11	2
12	1
13	4
14	3
15	2
16	1
17	6
18	1
19	10
20	3
21	2
22	1
23	6
24	13
25	4
26	3
27	4
28	1
29	2
30	1
31	10
32	11
33	10
34	3
35	2
36	1
37	4
38	5
39	2
40	1
41	2
42	1
43	4
44	9
45	14
46	1
47	6
48	5
49	4
50	3
51	2
52	1
53	14
54	5
55	6
56	5
57	4
58	1
59	12
60	1
61	6
62	5
63	10
64	3
65	2
66	1
67	4
68	15
69	2
70	1
71	8
72	1
73	6
74	27
75	8
76	3
77	6
78	1
79	4
80	3
81	2
82	1
83	6
84	5
85	12
86	11
87	20
88	1
89	12
90	7
91	6
92	5
93	4
94	3
95	2
96	1
97	4
98	5

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	1
7	4
8	5
9	2
10	1
11	2
12	1
13	4
14	3
15	2
16	1
17	6
18	1
19	10
20	3
21	2
22	1
23	6
24	13
25	4
26	3
27	4
28	1
29	2
30	1
31	10
32	11
33	10
34	3
35	2
36	1
37	4
38	5
39	2
40	1
41	2
42	1
43	4
44	9
45	14
46	1
47	6
48	5
49	4
50	3
51	2
52	1
53	14
54	5
55	6
56	5
57	4
58	1
59	12
60	1
61	6
62	5
63	10
64	3
65	2
66	1
67	4
68	15
69	2
70	1
71	8
72	1
73	6
74	27
75	8
76	3
77	6
78	1
79	4
80	3
81	2
82	1
83	6
84	5
85	12
86	11
87	20
88	1
89	12
90	7
91	6
92	5
93	4
94	3
95	2
96	1
97	4
98	5

n	a(n)
1	1
2	1
3	2
4	1
5	2
6	1
7	4
8	5
9	2
10	1
11	2
12	1
13	4
14	3
15	2
16	1
17	6
18	1
19	10
20	3
21	2
22	1
23	6
24	13
25	4
26	3
27	4
28	1
29	2
30	1
31	10
32	11
33	10
34	3
35	2
36	1
37	4
38	5
39	2
40	1
41	2
42	1
43	4
44	9
45	14
46	1
47	6
48	5
49	4
50	3
51	2
52	1
53	14
54	5
55	6
56	5
57	4
58	1
59	12
60	1
61	6
62	5
63	10
64	3
65	2
66	1
67	4
68	15
69	2
70	1
71	8
72	1
73	6
74	27
75	8
76	3
77	6
78	1
79	4
80	3
81	2
82	1
83	6
84	5
85	12
86	11
87	20
88	1
89	12
90	7
91	6
92	5
93	4
94	3
95	2
96	1
97	4
98	5