A054784 - cp's OEIS frontend

A054784 Integers n such that sigma(2n) - sigma(n) is a power of 2, where sigma is the sum of the divisors of n.

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	7
7	8
8	12
9	14
10	16
11	21
12	24
13	28
14	31
15	32
16	42
17	48
18	56
19	62
20	64
21	84
22	93
23	96
24	112
25	124
26	127
27	128
28	168
29	186
30	192
31	217
32	224
33	248
34	254
35	256
36	336
37	372
38	381
39	384
40	434
41	448
42	496
43	508
44	512
45	651
46	672
47	744
48	762
49	768
50	868
51	889
52	896
53	992
54	1016
55	1024
56	1302
57	1344
58	1488

[1, 2, 3, 4, 6, 7, 8, 12, 14, 16, 21, 24, 28, 31, 32, 42, 48, 56, 62, 64, 84, 93, 96, 112, 124, 127, 128, 168, 186, 192, 217, 224, 248, 254, 256, 336, 372, 381, 384, 434, 448, 496, 508, 512, 651, 672, 744, 762, 768, 868, 889, 896, 992, 1016, 1024, 1302, 1344, 1488]

cp's OEIS Frontend

A054784 Integers n such that sigma(2n) - sigma(n) is a power of 2, where sigma is the sum of the divisors of n.

Table of values

List of values