A249382 - cp's OEIS frontend

A249382 Smallest odd prime Q such that Q*2^prime(n)-1 is also a prime number.

n	a(n)
1	3
2	3
3	7
4	3
5	3
6	31
7	7
8	61
9	13
10	7
11	43
12	31
13	19
14	3
15	31
16	307
17	733
18	79
19	43
20	73
21	421
22	73
23	181
24	19
25	157
26	181
27	3
28	739
29	421
30	127
31	103
32	73
33	571
34	421
35	109
36	211
37	1459
38	103
39	1693
40	487
41	829
42	139
43	1153
44	439
45	3067
46	601
47	199
48	853
49	421
50	3541
51	1069
52	1279
53	1297

[3, 3, 7, 3, 3, 31, 7, 61, 13, 7, 43, 31, 19, 3, 31, 307, 733, 79, 43, 73, 421, 73, 181, 19, 157, 181, 3, 739, 421, 127, 103, 73, 571, 421, 109, 211, 1459, 103, 1693, 487, 829, 139, 1153, 439, 3067, 601, 199, 853, 421, 3541, 1069, 1279, 1297]

cp's OEIS Frontend

A249382 Smallest odd prime Q such that Q*2^prime(n)-1 is also a prime number.

Table of values

List of values