A246005 - cp's OEIS frontend

A246005 Least k such that ((2n+1)^k-1)/2n is prime, or 0 if no such k exists.

n	a(n)
1	3
2	3
3	5
4	0
5	17
6	5
7	3
8	3
9	19
10	3
11	5
12	0
13	3
14	5
15	7
16	3
17	313
18	13
19	349
20	3
21	5
22	19
23	127
24	0
25	4229
26	11
27	17
28	3
29	3
30	7
31	5
32	19
33	19
34	3
35	3
36	5
37	3
38	3
39	5
40	0
41	5
42	5
43	7
44	3
45	4421
46	7
47	7
48	17
49	3
50	3
51	19
52	3
53	17
54	17
55	3
56	23
57	7
58	3
59	3
60	0
61	43
62	0
63	5
64	5
65	3
66	13
67	1171
68	11
69	163
70	3
71	3
72	5
73	3
74	7
75	13
76	3
77	3
78	17
79	13
80	3
81	7
82	5
83	3
84	0
85	181
86	3
87	5
88	5
89	19
90	17
91	223

[3, 3, 5, 0, 17, 5, 3, 3, 19, 3, 5, 0, 3, 5, 7, 3, 313, 13, 349, 3, 5, 19, 127, 0, 4229, 11, 17, 3, 3, 7, 5, 19, 19, 3, 3, 5, 3, 3, 5, 0, 5, 5, 7, 3, 4421, 7, 7, 17, 3, 3, 19, 3, 17, 17, 3, 23, 7, 3, 3, 0, 43, 0, 5, 5, 3, 13, 1171, 11, 163, 3, 3, 5, 3, 7, 13, 3, 3, 17, 13, 3, 7, 5, 3, 0, 181, 3, 5, 5, 19, 17, 223]

cp's OEIS Frontend

A246005 Least k such that ((2n+1)^k-1)/2n is prime, or 0 if no such k exists.

Table of values

List of values