A329457 - cp's OEIS frontend

A329457 Least positive integer x such that both nx + n + x and nx - n - x are primes, or -1 if no such x exists.

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

[5, 4, 3, 2, 5, 2, 7, 2, 3, 3, 13, 2, 9, 2, 3, 3, 5, 2, 3, 4, 5, 6, 7, 3, 9, 5, 5, 4, 13, 3, 3, 2, 9, 4, 11, 3, 21, 4, 9, 3, 5, 2, 7, 2, 5, 4, 17, 2, 19, 5, 3, 7, 7, 2, 3, 5, 5, 7, 7, 8, 19, 2, 5, 3, 23, 3, 15, 5, 3, 6, 19, 11, 67, 2, 3, 3, 7, 5, 9, 4, 9, 6, 5, 2, 13, 4]

cp's OEIS Frontend

A329457 Least positive integer x such that both nx + n + x and nx - n - x are primes, or -1 if no such x exists.

Table of values

List of values

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

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

cp's OEIS Frontend

A329457 Least positive integer x such that both n*x + n + x and n*x - n - x are primes, or -1 if no such x exists.

Table of values

List of values

A329457 Least positive integer x such that both nx + n + x and nx - n - x are primes, or -1 if no such x exists.

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