A194638 - cp's OEIS frontend

A194638 Smallest prime either of the form (2n-1)2^k - 1 or (2n-1)2^k + 1, k >= 0, or 0 if no such prime exists.

n	a(n)
1	2
2	2
3	11
4	13
5	17
6	23
7	53
8	29
9	67
10	37
11	41
12	47
13	101
14	53
15	59
16	61
17	67
18	71
19	73
20	79
21	83
22	173
23	89
24	751
25	97
26	101
27	107
28	109
29	113
30	1889
31	487
32	127
33	131
34	269
35	137
36	283
37	293
38	149
39	307
40	157
41	163
42	167
43	1361
44	173
45	179
46	181
47	373
48	191
49	193
50	197
51	809
52	823
53	211
54	857
55	6977
56	223
57	227

[2, 2, 11, 13, 17, 23, 53, 29, 67, 37, 41, 47, 101, 53, 59, 61, 67, 71, 73, 79, 83, 173, 89, 751, 97, 101, 107, 109, 113, 1889, 487, 127, 131, 269, 137, 283, 293, 149, 307, 157, 163, 167, 1361, 173, 179, 181, 373, 191, 193, 197, 809, 823, 211, 857, 6977, 223, 227]

cp's OEIS Frontend

A194638 Smallest prime either of the form (2n-1)2^k - 1 or (2n-1)2^k + 1, k >= 0, or 0 if no such prime exists.

Table of values

List of values

cp's OEIS Frontend

A194638 Smallest prime either of the form (2*n-1)*2^k - 1 or (2*n-1)*2^k + 1, k >= 0, or 0 if no such prime exists.

Table of values

List of values

A194638 Smallest prime either of the form (2n-1)2^k - 1 or (2n-1)2^k + 1, k >= 0, or 0 if no such prime exists.