A343738 - cp's OEIS frontend

A343738 a(n) is the smallest prime p > k such that p + k is a power of 2, where k = 2*n - 1, or 0 if no such prime exists.

n	a(n)
1	3
2	5
3	11
4	549755813881
5	23
6	53
7	19
8	17
9	47
10	109
11	43
12	41
13	103
14	37
15	227
16	97
17	223
18	16349
19	2011
20	89
21	983
22	536870869
23	83
24	977
25	79
26	461
27	971
28	73
29	71
30	197
31	67
32	193
33	191
34	524221
35	443
36	953
37	439
38	181
39	179
40	433
41	431
42	173
43	130987
44	937
45	167
46	421
47	163
48	929
49	1951
50	157

[3, 5, 11, 549755813881, 23, 53, 19, 17, 47, 109, 43, 41, 103, 37, 227, 97, 223, 16349, 2011, 89, 983, 536870869, 83, 977, 79, 461, 971, 73, 71, 197, 67, 193, 191, 524221, 443, 953, 439, 181, 179, 433, 431, 173, 130987, 937, 167, 421, 163, 929, 1951, 157]

cp's OEIS Frontend

A343738 a(n) is the smallest prime p > k such that p + k is a power of 2, where k = 2*n - 1, or 0 if no such prime exists.

Table of values

List of values