A242273 - cp's OEIS frontend

A242273 Numbers n such that n*2^n - 1 is a semiprime.

n	a(n)
1	5
2	7
3	8
4	9
5	10
6	12
7	18
8	20
9	25
10	32
11	37
12	39
13	72
14	80
15	85
16	90
17	97
18	142
19	150
20	159
21	163
22	168
23	169
24	186
25	192
26	211
27	231
28	272
29	305
30	349
31	363
32	369
33	375
34	463
35	465
36	615
37	668
38	672
39	789
40	797
41	817
42	859
43	908
44	938
45	951
46	1092
47	1123

[5, 7, 8, 9, 10, 12, 18, 20, 25, 32, 37, 39, 72, 80, 85, 90, 97, 142, 150, 159, 163, 168, 169, 186, 192, 211, 231, 272, 305, 349, 363, 369, 375, 463, 465, 615, 668, 672, 789, 797, 817, 859, 908, 938, 951, 1092, 1123]

cp's OEIS Frontend

A242273 Numbers n such that n*2^n - 1 is a semiprime.

Table of values

List of values