A083288 - cp's OEIS frontend

A083288 Sigma unitary-sigma perfect numbers: numbers m which satisfy the following equation for some integer k: sigma(usigma(m)) = k*m where usigma(m) is sum of unitary divisors of m.

n	a(n)
1	1
2	2
3	9
4	15
5	18
6	21
7	40
8	42
9	60
10	104
11	120
12	288
13	312
14	756
15	1023
16	1170
17	2160
18	2520
19	3024
20	4092
21	6048
22	6552
23	8184
24	17850
25	18720
26	29127
27	30690
28	40768
29	58254
30	79794
31	147312
32	285600
33	491040
34	507780
35	556920
36	932064
37	1276704
38	1966020
39	3300570
40	4134780
41	4194288
42	4470648

[1, 2, 9, 15, 18, 21, 40, 42, 60, 104, 120, 288, 312, 756, 1023, 1170, 2160, 2520, 3024, 4092, 6048, 6552, 8184, 17850, 18720, 29127, 30690, 40768, 58254, 79794, 147312, 285600, 491040, 507780, 556920, 932064, 1276704, 1966020, 3300570, 4134780, 4194288, 4470648]

cp's OEIS Frontend

A083288 Sigma unitary-sigma perfect numbers: numbers m which satisfy the following equation for some integer k: sigma(usigma(m)) = k*m where usigma(m) is sum of unitary divisors of m.

Table of values

List of values