A109510 - cp's OEIS frontend

A109510 Values of n such that sigma(n)-2n (the abundance of n) is a (nonnegative) square.

n	a(n)
1	6
2	12
3	28
4	70
5	88
6	108
7	168
8	220
9	348
10	496
11	550
12	580
13	726
14	748
15	798
16	910
17	918
18	952
19	1032
20	1120
21	1200
22	1240
23	1504
24	1644
25	1672
26	1840
27	1888
28	2140
29	2205
30	2392
31	2470
32	2472
33	2814
34	3190
35	3222
36	3580
37	3804
38	4030
39	4648
40	4732
41	4758
42	5032
43	5670
44	5830

[6, 12, 28, 70, 88, 108, 168, 220, 348, 496, 550, 580, 726, 748, 798, 910, 918, 952, 1032, 1120, 1200, 1240, 1504, 1644, 1672, 1840, 1888, 2140, 2205, 2392, 2470, 2472, 2814, 3190, 3222, 3580, 3804, 4030, 4648, 4732, 4758, 5032, 5670, 5830]

cp's OEIS Frontend

A109510 Values of n such that sigma(n)-2n (the abundance of n) is a (nonnegative) square.

Table of values

List of values