A244079 - cp's OEIS frontend

A244079 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)*sigma(b) = n.

n	a(n)
1	28
2	120
3	162
4	196
5	868
6	1260
7	1302
8	1800
9	2016
10	2480
11	3780
12	4464
13	6804
14	7440
15	8370
16	9882
17	22200
18	32640
19	34290
20	35640
21	40640
22	73152
23	127008
24	187488
25	213776
26	489888
27	572880
28	602640
29	674082
30	1074528
31	1077120
32	1397088
33	1536192
34	1582560
35	1662120
36	1669164
37	1781136
38	1905120

[28, 120, 162, 196, 868, 1260, 1302, 1800, 2016, 2480, 3780, 4464, 6804, 7440, 8370, 9882, 22200, 32640, 34290, 35640, 40640, 73152, 127008, 187488, 213776, 489888, 572880, 602640, 674082, 1074528, 1077120, 1397088, 1536192, 1582560, 1662120, 1669164, 1781136, 1905120]

cp's OEIS Frontend

A244079 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)*sigma(b) = n.

Table of values

List of values