A259832 - cp's OEIS frontend

A259832 Numbers n with the property that it is possible to write the base 2 expansion of n as concat(a_2,b_2), with a_2>0 and b_2>0 such that, converting a_2 and b_2 to base 10 as a and b, we have (sigma(a)-a)*(sigma(b)-b) = sigma(n).

n	a(n)
1	7708
2	9020
3	86934
4	92128
5	120228
6	325180
7	372000
8	491630
9	565724
10	739032
11	862780
12	1120024
13	1344090
14	1419304
15	1440858
16	1678232
17	2752626
18	2980515
19	3684344
20	4154418
21	4860476
22	7539610
23	7565257
24	9527064
25	11025372
26	12277728
27	17002336
28	20256672
29	22528536
30	24597984

[7708, 9020, 86934, 92128, 120228, 325180, 372000, 491630, 565724, 739032, 862780, 1120024, 1344090, 1419304, 1440858, 1678232, 2752626, 2980515, 3684344, 4154418, 4860476, 7539610, 7565257, 9527064, 11025372, 12277728, 17002336, 20256672, 22528536, 24597984]

cp's OEIS Frontend

A259832 Numbers n with the property that it is possible to write the base 2 expansion of n as concat(a_2,b_2), with a_2>0 and b_2>0 such that, converting a_2 and b_2 to base 10 as a and b, we have (sigma(a)-a)*(sigma(b)-b) = sigma(n).

Table of values

List of values