A250291 - cp's OEIS frontend

A250291 Numbers k such that (2^k+1)/3 is a semiprime.

n	a(n)
1	29
2	37
3	41
4	47
5	49
6	53
7	67
8	71
9	73
10	103
11	107
12	109
13	139
14	151
15	179
16	223
17	229
18	251
19	269
20	277
21	311
22	349
23	353
24	433
25	457
26	487
27	503
28	599
29	601
30	613
31	619
32	643
33	739
34	757
35	827
36	839
37	1031
38	1061
39	1117
40	1123
41	1217

[29, 37, 41, 47, 49, 53, 67, 71, 73, 103, 107, 109, 139, 151, 179, 223, 229, 251, 269, 277, 311, 349, 353, 433, 457, 487, 503, 599, 601, 613, 619, 643, 739, 757, 827, 839, 1031, 1061, 1117, 1123, 1217]

cp's OEIS Frontend

A250291 Numbers k such that (2^k+1)/3 is a semiprime.

Table of values

List of values