A085724 - cp's OEIS frontend

A085724 Numbers k such that 2^k - 1 is a semiprime (A001358).

n	a(n)
1	4
2	9
3	11
4	23
5	37
6	41
7	49
8	59
9	67
10	83
11	97
12	101
13	103
14	109
15	131
16	137
17	139
18	149
19	167
20	197
21	199
22	227
23	241
24	269
25	271
26	281
27	293
28	347
29	373
30	379
31	421
32	457
33	487
34	523
35	727
36	809
37	881
38	971
39	983
40	997
41	1061
42	1063

[4, 9, 11, 23, 37, 41, 49, 59, 67, 83, 97, 101, 103, 109, 131, 137, 139, 149, 167, 197, 199, 227, 241, 269, 271, 281, 293, 347, 373, 379, 421, 457, 487, 523, 727, 809, 881, 971, 983, 997, 1061, 1063]

cp's OEIS Frontend

A085724 Numbers k such that 2^k - 1 is a semiprime (A001358).

Table of values

List of values