A309498 - cp's OEIS frontend

A309498 Least number k > 0 such that 4p^2k^2 + 1 is prime, where p = prime(n) is the n-th prime.

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

[1, 1, 1, 1, 3, 1, 5, 15, 4, 2, 2, 1, 13, 5, 1, 6, 2, 13, 1, 2, 1, 3, 9, 5, 10, 5, 1, 5, 2, 9, 6, 8, 4, 2, 7, 3, 1, 1, 10, 11, 2, 7, 2, 1, 4, 5, 13, 4, 4, 3, 1, 3, 7, 2, 4, 6, 3, 7, 5, 2, 20, 6, 4, 2, 6, 1, 2, 1, 4, 3, 4, 3, 5, 5, 5, 16, 2, 14, 3, 3, 2, 2, 5, 5]

cp's OEIS Frontend

A309498 Least number k > 0 such that 4p^2k^2 + 1 is prime, where p = prime(n) is the n-th prime.

Table of values

List of values

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

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

cp's OEIS Frontend

A309498 Least number k > 0 such that 4*p^2*k^2 + 1 is prime, where p = prime(n) is the n-th prime.

Table of values

List of values

A309498 Least number k > 0 such that 4p^2k^2 + 1 is prime, where p = prime(n) is the n-th prime.

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