A238554 - cp's OEIS frontend

A238554 Smallest k such that k + 2^n and k*2^n + 1 are both prime.

n	a(n)
0	1
1	1
2	1
3	5
4	1
5	11
6	3
7	9
8	1
9	35
10	15
11	39
12	3
13	39
14	63
15	35
16	1
17	149
18	3
19	419
20	7
21	221
22	25
23	155
24	73
25	735
26	69
27	29
28	193
29	261
30	3
31	135
32	81
33	149
34	85
35	125
36	117
37	809
38	303
39	509
40	27
41	699
42	325
43	29
44	27
45	285
46	639
47	65
48	61
49	1911
50	639
51	165
52	295
53	1295
54	163
55	905
56	175
57	75
58	1593
59	249

[1, 1, 1, 5, 1, 11, 3, 9, 1, 35, 15, 39, 3, 39, 63, 35, 1, 149, 3, 419, 7, 221, 25, 155, 73, 735, 69, 29, 193, 261, 3, 135, 81, 149, 85, 125, 117, 809, 303, 509, 27, 699, 325, 29, 27, 285, 639, 65, 61, 1911, 639, 165, 295, 1295, 163, 905, 175, 75, 1593, 249]

cp's OEIS Frontend

A238554 Smallest k such that k + 2^n and k*2^n + 1 are both prime.

Table of values

List of values