A065813 - cp's OEIS frontend

A065813 Least m such that (p^(2*m+1)-1)/(p-1) is a prime, where p = prime(n).

n	a(n)
1	1
2	1
3	1
4	2
5	8
6	2
7	1
8	9
9	2
10	2
11	3
12	6
13	1
14	2
15	63
16	5
17	1
18	3
19	9
20	1
21	2
22	2
23	2
24	1
25	8
26	1
27	9
28	8
29	8
30	11
31	2
32	1
33	5
34	81
35	3
36	6
37	8
38	3
39	1
40	1
41	9
42	8
43	8
44	2
45	15
46	288
47	20
48	119
49	2
50	5
51	56
52	2
53	8
54	3
55	11
56	2

[1, 1, 1, 2, 8, 2, 1, 9, 2, 2, 3, 6, 1, 2, 63, 5, 1, 3, 9, 1, 2, 2, 2, 1, 8, 1, 9, 8, 8, 11, 2, 1, 5, 81, 3, 6, 8, 3, 1, 1, 9, 8, 8, 2, 15, 288, 20, 119, 2, 5, 56, 2, 8, 3, 11, 2]

cp's OEIS Frontend

A065813 Least m such that (p^(2*m+1)-1)/(p-1) is a prime, where p = prime(n).

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	2
5	8
6	2
7	1
8	9
9	2
10	2
11	3
12	6
13	1
14	2
15	63
16	5
17	1
18	3
19	9
20	1
21	2
22	2
23	2
24	1
25	8
26	1
27	9
28	8
29	8
30	11
31	2
32	1
33	5
34	81
35	3
36	6
37	8
38	3
39	1
40	1
41	9
42	8
43	8
44	2
45	15
46	288
47	20
48	119
49	2
50	5
51	56
52	2
53	8
54	3
55	11
56	2

n	a(n)
1	1
2	1
3	1
4	2
5	8
6	2
7	1
8	9
9	2
10	2
11	3
12	6
13	1
14	2
15	63
16	5
17	1
18	3
19	9
20	1
21	2
22	2
23	2
24	1
25	8
26	1
27	9
28	8
29	8
30	11
31	2
32	1
33	5
34	81
35	3
36	6
37	8
38	3
39	1
40	1
41	9
42	8
43	8
44	2
45	15
46	288
47	20
48	119
49	2
50	5
51	56
52	2
53	8
54	3
55	11
56	2

n	a(n)
1	1
2	1
3	1
4	2
5	8
6	2
7	1
8	9
9	2
10	2
11	3
12	6
13	1
14	2
15	63
16	5
17	1
18	3
19	9
20	1
21	2
22	2
23	2
24	1
25	8
26	1
27	9
28	8
29	8
30	11
31	2
32	1
33	5
34	81
35	3
36	6
37	8
38	3
39	1
40	1
41	9
42	8
43	8
44	2
45	15
46	288
47	20
48	119
49	2
50	5
51	56
52	2
53	8
54	3
55	11
56	2