A125958 - cp's OEIS frontend

A125958 Least number k > 0 such that (2^k + (2n-1)^k)/(2n+1) is prime.

n	a(n)
1	3
2	3
3	3
4	5
5	3
6	3
7	7
8	3
9	5
10	5
11	11
12	3
13	19
14	11
15	3
16	229
17	47
18	5
19	257
20	3
21	19
22	31
23	17
24	11
25	13
26	3
27	3
28	5
29	5
30	59
31	23
32	3
33	3
34	7
35	79
36	3
37	3373
38	3
39	3
40	7
41	13
42	7
43	7
44	3527
45	593
46	19
47	3
48	3
49	13
50	13
51	11
52	19
53	41
54	3
55	7
56	109
57	3
58	227
59	13
60	5
61	5
62	3
63	239
64	5
65	3251
66	3
67	1237
68	3
69	7
70	31
71	3
72	7

[3, 3, 3, 5, 3, 3, 7, 3, 5, 5, 11, 3, 19, 11, 3, 229, 47, 5, 257, 3, 19, 31, 17, 11, 13, 3, 3, 5, 5, 59, 23, 3, 3, 7, 79, 3, 3373, 3, 3, 7, 13, 7, 7, 3527, 593, 19, 3, 3, 13, 13, 11, 19, 41, 3, 7, 109, 3, 227, 13, 5, 5, 3, 239, 5, 3251, 3, 1237, 3, 7, 31, 3, 7]

cp's OEIS Frontend

A125958 Least number k > 0 such that (2^k + (2n-1)^k)/(2n+1) is prime.

Table of values

List of values