A105016 - cp's OEIS frontend

A105016 Smallest a(n) such that a(n)^2 - n is a positive prime, or 0 if no such a(n) exists.

n	a(n)
0	0
1	2
2	2
3	4
4	3
5	4
6	3
7	3
8	5
9	4
10	9
11	4
12	5
13	4
14	4
15	14
16	0
17	6
18	5
19	6
20	5
21	8
22	5
23	5
24	11
25	6
26	7
27	8
28	9
29	6
30	7
31	6
32	7
33	6
34	6
35	8
36	7
37	12
38	7
39	10
40	9
41	8
42	7
43	12
44	7
45	8
46	7
47	7
48	11
49	0
50	9
51	8
52	9
53	8
54	11
55	12
56	13
57	8
58	9
59	8
60	11
61	8
62	8
63	10
64	9
65	12
66	13
67	18
68	9
69	10
70	9
71	10
72	13
73	12
74	9
75	16
76	9
77	10
78	9
79	9
80	11
81	10
82	21
83	10
84	11
85	12
86	13
87	10
88	15
89	10

[0, 2, 2, 4, 3, 4, 3, 3, 5, 4, 9, 4, 5, 4, 4, 14, 0, 6, 5, 6, 5, 8, 5, 5, 11, 6, 7, 8, 9, 6, 7, 6, 7, 6, 6, 8, 7, 12, 7, 10, 9, 8, 7, 12, 7, 8, 7, 7, 11, 0, 9, 8, 9, 8, 11, 12, 13, 8, 9, 8, 11, 8, 8, 10, 9, 12, 13, 18, 9, 10, 9, 10, 13, 12, 9, 16, 9, 10, 9, 9, 11, 10, 21, 10, 11, 12, 13, 10, 15, 10]

cp's OEIS Frontend

A105016 Smallest a(n) such that a(n)^2 - n is a positive prime, or 0 if no such a(n) exists.

Table of values

List of values

n	a(n)
0	0
1	2
2	2
3	4
4	3
5	4
6	3
7	3
8	5
9	4
10	9
11	4
12	5
13	4
14	4
15	14
16	0
17	6
18	5
19	6
20	5
21	8
22	5
23	5
24	11
25	6
26	7
27	8
28	9
29	6
30	7
31	6
32	7
33	6
34	6
35	8
36	7
37	12
38	7
39	10
40	9
41	8
42	7
43	12
44	7
45	8
46	7
47	7
48	11
49	0
50	9
51	8
52	9
53	8
54	11
55	12
56	13
57	8
58	9
59	8
60	11
61	8
62	8
63	10
64	9
65	12
66	13
67	18
68	9
69	10
70	9
71	10
72	13
73	12
74	9
75	16
76	9
77	10
78	9
79	9
80	11
81	10
82	21
83	10
84	11
85	12
86	13
87	10
88	15
89	10

n	a(n)
0	0
1	2
2	2
3	4
4	3
5	4
6	3
7	3
8	5
9	4
10	9
11	4
12	5
13	4
14	4
15	14
16	0
17	6
18	5
19	6
20	5
21	8
22	5
23	5
24	11
25	6
26	7
27	8
28	9
29	6
30	7
31	6
32	7
33	6
34	6
35	8
36	7
37	12
38	7
39	10
40	9
41	8
42	7
43	12
44	7
45	8
46	7
47	7
48	11
49	0
50	9
51	8
52	9
53	8
54	11
55	12
56	13
57	8
58	9
59	8
60	11
61	8
62	8
63	10
64	9
65	12
66	13
67	18
68	9
69	10
70	9
71	10
72	13
73	12
74	9
75	16
76	9
77	10
78	9
79	9
80	11
81	10
82	21
83	10
84	11
85	12
86	13
87	10
88	15
89	10

n	a(n)
0	0
1	2
2	2
3	4
4	3
5	4
6	3
7	3
8	5
9	4
10	9
11	4
12	5
13	4
14	4
15	14
16	0
17	6
18	5
19	6
20	5
21	8
22	5
23	5
24	11
25	6
26	7
27	8
28	9
29	6
30	7
31	6
32	7
33	6
34	6
35	8
36	7
37	12
38	7
39	10
40	9
41	8
42	7
43	12
44	7
45	8
46	7
47	7
48	11
49	0
50	9
51	8
52	9
53	8
54	11
55	12
56	13
57	8
58	9
59	8
60	11
61	8
62	8
63	10
64	9
65	12
66	13
67	18
68	9
69	10
70	9
71	10
72	13
73	12
74	9
75	16
76	9
77	10
78	9
79	9
80	11
81	10
82	21
83	10
84	11
85	12
86	13
87	10
88	15
89	10