A066112 - cp's OEIS frontend

A066112 Numbers k such that sigma_4(k)/sigma_2(k) is an integer but not a prime.

n	a(n)
1	1
2	16
3	36
4	48
5	49
6	64
7	81
8	100
9	121
10	144
11	162
12	180
13	196
14	225
15	245
16	256
17	324
18	361
19	400
20	432
21	441
22	484
23	500
24	529
25	576
26	605
27	625
28	648
29	676
30	729
31	784
32	841
33	900
34	931
35	980
36	1024
37	1089
38	1156
39	1200
40	1225
41	1280
42	1296
43	1369
44	1444
45	1521
46	1600
47	1620
48	1681
49	1764
50	1805

[1, 16, 36, 48, 49, 64, 81, 100, 121, 144, 162, 180, 196, 225, 245, 256, 324, 361, 400, 432, 441, 484, 500, 529, 576, 605, 625, 648, 676, 729, 784, 841, 900, 931, 980, 1024, 1089, 1156, 1200, 1225, 1280, 1296, 1369, 1444, 1521, 1600, 1620, 1681, 1764, 1805]

cp's OEIS Frontend

A066112 Numbers k such that sigma_4(k)/sigma_2(k) is an integer but not a prime.

Table of values

List of values