A110079 - cp's OEIS frontend

A110079 Numbers n such that sigma(n)=2n-2^d(n) where d(n) is number of positive divisors of n.

n	a(n)
1	5
2	38
3	284
4	1370
5	2168
6	26828
7	133088
8	1515608
9	19414448
10	23521328
11	25812848
12	49353008
13	82988756
14	103575728
15	537394688
16	558504608
17	921747488
18	2651596448
19	17517611968
20	18249863488
21	77792665408
22	556915822208

[5, 38, 284, 1370, 2168, 26828, 133088, 1515608, 19414448, 23521328, 25812848, 49353008, 82988756, 103575728, 537394688, 558504608, 921747488, 2651596448, 17517611968, 18249863488, 77792665408, 556915822208]

cp's OEIS Frontend

A110079 Numbers n such that sigma(n)=2n-2^d(n) where d(n) is number of positive divisors of n.

Table of values

List of values