A268235 - cp's OEIS frontend

A268235 a(n) = Sum_{k=1..n} floor(n/k)*2^(k-1).

n	a(n)
1	1
2	4
3	9
4	20
5	37
6	76
7	141
8	280
9	541
10	1072
11	2097
12	4192
13	8289
14	16548
15	32953
16	65860
17	131397
18	262764
19	524909
20	1049736
21	2098381
22	4196560
23	8390865
24	16781696
25	33558929
26	67117460
27	134226585
28	268452580
29	536888037
30	1073775900
31	2147517725
32	4295034280
33	8590002605
34	17180002736
35	34359872001
36	68719743792

[1, 4, 9, 20, 37, 76, 141, 280, 541, 1072, 2097, 4192, 8289, 16548, 32953, 65860, 131397, 262764, 524909, 1049736, 2098381, 4196560, 8390865, 16781696, 33558929, 67117460, 134226585, 268452580, 536888037, 1073775900, 2147517725, 4295034280, 8590002605, 17180002736, 34359872001, 68719743792]

cp's OEIS Frontend

A268235 a(n) = Sum_{k=1..n} floor(n/k)*2^(k-1).

Table of values

List of values