A174269 - cp's OEIS frontend

A174269 Numbers k such that exactly one of 2^k - 1 and 2^k + 1 is a prime.

n	a(n)
1	0
2	1
3	3
4	4
5	5
6	7
7	8
8	13
9	16
10	17
11	19
12	31
13	61
14	89
15	107
16	127
17	521
18	607
19	1279
20	2203
21	2281
22	3217
23	4253
24	4423
25	9689
26	9941
27	11213
28	19937
29	21701
30	23209
31	44497
32	86243
33	110503
34	132049
35	216091
36	756839
37	859433
38	1257787
39	1398269
40	2976221
41	3021377
42	6972593
43	13466917

[0, 1, 3, 4, 5, 7, 8, 13, 16, 17, 19, 31, 61, 89, 107, 127, 521, 607, 1279, 2203, 2281, 3217, 4253, 4423, 9689, 9941, 11213, 19937, 21701, 23209, 44497, 86243, 110503, 132049, 216091, 756839, 859433, 1257787, 1398269, 2976221, 3021377, 6972593, 13466917]

cp's OEIS Frontend

A174269 Numbers k such that exactly one of 2^k - 1 and 2^k + 1 is a prime.

Table of values

List of values