A051899 - cp's OEIS frontend

A051899 Smallest prime p such that (p-1)/(2*n) is also a prime.

n	a(n)
1	5
2	13
3	13
4	17
5	31
6	37
7	29
8	113
9	37
10	41
11	67
12	73
13	53
14	197
15	61
16	97
17	103
18	73
19	191
20	281
21	127
22	89
23	139
24	97
25	101
26	157
27	109
28	113
29	1103
30	181
31	311
32	193
33	199
34	137
35	211
36	937
37	149
38	229
39	157
40	241
41	1559
42	421
43	173
44	617
45	181
46	277
47	283
48	193
49	197
50	701
51	307
52	313
53	743
54	541
55	331

[5, 13, 13, 17, 31, 37, 29, 113, 37, 41, 67, 73, 53, 197, 61, 97, 103, 73, 191, 281, 127, 89, 139, 97, 101, 157, 109, 113, 1103, 181, 311, 193, 199, 137, 211, 937, 149, 229, 157, 241, 1559, 421, 173, 617, 181, 277, 283, 193, 197, 701, 307, 313, 743, 541, 331]

cp's OEIS Frontend

A051899 Smallest prime p such that (p-1)/(2*n) is also a prime.

Table of values

List of values