A133856 - cp's OEIS frontend

A133856 Least number k > (2n-1) such that (2n-1)^k - 2 is prime, or 0 if no such number exists.

n	a(n)
1	0
2	4
3	14
4	8
5	11
6	22420
7	78
8	17
9	24
10	20
11	25
12	24
13	63
14	30
15	42
16	69
17	128
18	50
19	119
20	204
21	2816
22	76
23	52
24	288
25	64
26	66
27	184
28	153
29	67
30	268
31	78
32	210
33	438
34	295
35	96
36	74
37	136
38	128
39	2900
40	1898
41	130
42	92
43	381
44	106
45	18626
46	97
47	98
48	1650
49	747
50	109
51	214
52	113
53	312
54	354
55	1702
56	560
57	2798
58	123
59	171
60	554
61	11210
62	834
63	208
64	990
65	9271

[0, 4, 14, 8, 11, 22420, 78, 17, 24, 20, 25, 24, 63, 30, 42, 69, 128, 50, 119, 204, 2816, 76, 52, 288, 64, 66, 184, 153, 67, 268, 78, 210, 438, 295, 96, 74, 136, 128, 2900, 1898, 130, 92, 381, 106, 18626, 97, 98, 1650, 747, 109, 214, 113, 312, 354, 1702, 560, 2798, 123, 171, 554, 11210, 834, 208, 990, 9271]

cp's OEIS Frontend

A133856 Least number k > (2n-1) such that (2n-1)^k - 2 is prime, or 0 if no such number exists.

Table of values

List of values