A126715 - cp's OEIS frontend

A126715 a(n) is the smallest odd prime p such that p*2^n - 1 is prime.

n	a(n)
0	3
1	3
2	3
3	3
4	3
5	7
6	3
7	3
8	5
9	7
10	5
11	3
12	5
13	31
14	5
15	79
16	17
17	7
18	3
19	61
20	17
21	7
22	83
23	13
24	83
25	61
26	11
27	193
28	83
29	7
30	521
31	43
32	5
33	31
34	3
35	31
36	17
37	31
38	3
39	61
40	107
41	19
42	53
43	3
44	557
45	7
46	23
47	31
48	5
49	19
50	11
51	1033
52	89
53	307
54	5
55	3
56	563
57	79
58	83
59	733
60	17
61	79
62	53
63	61
64	3
65	67
66	257
67	43
68	179
69	139
70	47
71	73
72	5
73	421
74	113

[3, 3, 3, 3, 3, 7, 3, 3, 5, 7, 5, 3, 5, 31, 5, 79, 17, 7, 3, 61, 17, 7, 83, 13, 83, 61, 11, 193, 83, 7, 521, 43, 5, 31, 3, 31, 17, 31, 3, 61, 107, 19, 53, 3, 557, 7, 23, 31, 5, 19, 11, 1033, 89, 307, 5, 3, 563, 79, 83, 733, 17, 79, 53, 61, 3, 67, 257, 43, 179, 139, 47, 73, 5, 421, 113]

cp's OEIS Frontend

A126715 a(n) is the smallest odd prime p such that p*2^n - 1 is prime.

Table of values

List of values