A231734 - cp's OEIS frontend

A231734 Least k such that n*k^2 - 1 is a prime, or 0 if no such k exists.

n	a(n)
1	2
2	2
3	1
4	1
5	2
6	1
7	6
8	1
9	0
10	3
11	2
12	1
13	6
14	1
15	2
16	0
17	2
18	1
19	6
20	1
21	2
22	3
23	4
24	1
25	0
26	2
27	2
28	3
29	4
30	1
31	12
32	1
33	2
34	6
35	2
36	0
37	18
38	1
39	14
40	3
41	2
42	1
43	18
44	1
45	2
46	27
47	4
48	1
49	0
50	2
51	10
52	3
53	2
54	1
55	6
56	2
57	2
58	3
59	20
60	1
61	12
62	1
63	2
64	0
65	4
66	2
67	6
68	1
69	4
70	9
71	2
72	1
73	30
74	1
75	6
76	3
77	2
78	2
79	6
80	1
81	0
82	12
83	2
84	1
85	12
86	3
87	2

[2, 2, 1, 1, 2, 1, 6, 1, 0, 3, 2, 1, 6, 1, 2, 0, 2, 1, 6, 1, 2, 3, 4, 1, 0, 2, 2, 3, 4, 1, 12, 1, 2, 6, 2, 0, 18, 1, 14, 3, 2, 1, 18, 1, 2, 27, 4, 1, 0, 2, 10, 3, 2, 1, 6, 2, 2, 3, 20, 1, 12, 1, 2, 0, 4, 2, 6, 1, 4, 9, 2, 1, 30, 1, 6, 3, 2, 2, 6, 1, 0, 12, 2, 1, 12, 3, 2]

cp's OEIS Frontend

A231734 Least k such that n*k^2 - 1 is a prime, or 0 if no such k exists.

Table of values

List of values

n	a(n)
1	2
2	2
3	1
4	1
5	2
6	1
7	6
8	1
9	0
10	3
11	2
12	1
13	6
14	1
15	2
16	0
17	2
18	1
19	6
20	1
21	2
22	3
23	4
24	1
25	0
26	2
27	2
28	3
29	4
30	1
31	12
32	1
33	2
34	6
35	2
36	0
37	18
38	1
39	14
40	3
41	2
42	1
43	18
44	1
45	2
46	27
47	4
48	1
49	0
50	2
51	10
52	3
53	2
54	1
55	6
56	2
57	2
58	3
59	20
60	1
61	12
62	1
63	2
64	0
65	4
66	2
67	6
68	1
69	4
70	9
71	2
72	1
73	30
74	1
75	6
76	3
77	2
78	2
79	6
80	1
81	0
82	12
83	2
84	1
85	12
86	3
87	2

n	a(n)
1	2
2	2
3	1
4	1
5	2
6	1
7	6
8	1
9	0
10	3
11	2
12	1
13	6
14	1
15	2
16	0
17	2
18	1
19	6
20	1
21	2
22	3
23	4
24	1
25	0
26	2
27	2
28	3
29	4
30	1
31	12
32	1
33	2
34	6
35	2
36	0
37	18
38	1
39	14
40	3
41	2
42	1
43	18
44	1
45	2
46	27
47	4
48	1
49	0
50	2
51	10
52	3
53	2
54	1
55	6
56	2
57	2
58	3
59	20
60	1
61	12
62	1
63	2
64	0
65	4
66	2
67	6
68	1
69	4
70	9
71	2
72	1
73	30
74	1
75	6
76	3
77	2
78	2
79	6
80	1
81	0
82	12
83	2
84	1
85	12
86	3
87	2

n	a(n)
1	2
2	2
3	1
4	1
5	2
6	1
7	6
8	1
9	0
10	3
11	2
12	1
13	6
14	1
15	2
16	0
17	2
18	1
19	6
20	1
21	2
22	3
23	4
24	1
25	0
26	2
27	2
28	3
29	4
30	1
31	12
32	1
33	2
34	6
35	2
36	0
37	18
38	1
39	14
40	3
41	2
42	1
43	18
44	1
45	2
46	27
47	4
48	1
49	0
50	2
51	10
52	3
53	2
54	1
55	6
56	2
57	2
58	3
59	20
60	1
61	12
62	1
63	2
64	0
65	4
66	2
67	6
68	1
69	4
70	9
71	2
72	1
73	30
74	1
75	6
76	3
77	2
78	2
79	6
80	1
81	0
82	12
83	2
84	1
85	12
86	3
87	2