A145641 - cp's OEIS frontend

A145641 Numbers whose binary representation is the concatenation of n 1's, n 0's and n 1's.

n	a(n)
1	5
2	51
3	455
4	3855
5	31775
6	258111
7	2080895
8	16711935
9	133956095
10	1072694271
11	8585742335
12	68702703615
13	549688713215
14	4397778092031
15	35183298379775
16	281470681808895
17	2251782633947135
18	18014329790267391
19	144114913198473215
20	1152920405096267775
21	9223367638810361855

[5, 51, 455, 3855, 31775, 258111, 2080895, 16711935, 133956095, 1072694271, 8585742335, 68702703615, 549688713215, 4397778092031, 35183298379775, 281470681808895, 2251782633947135, 18014329790267391, 144114913198473215, 1152920405096267775, 9223367638810361855]

cp's OEIS Frontend

A145641 Numbers whose binary representation is the concatenation of n 1's, n 0's and n 1's.

Table of values

List of values