A065772 - cp's OEIS frontend

A065772 Nontrivial prime powers k from A025475 such that tau(k^2) is prime but sigma(k^2) is a composite number.

n	a(n)
1	9
2	25
3	32
4	121
5	243
6	343
7	361
8	961
9	1331
10	1369
11	1681
12	2048
13	2209
14	2809
15	3481
16	3721
17	4489
18	5041
19	6561
20	6859
21	7921
22	9409
23	10201
24	10609
25	11449
26	11881
27	12167
28	12769
29	16384
30	16807
31	17161
32	18769
33	19321
34	19683
35	22201
36	22801
37	24389
38	24649
39	26569

[9, 25, 32, 121, 243, 343, 361, 961, 1331, 1369, 1681, 2048, 2209, 2809, 3481, 3721, 4489, 5041, 6561, 6859, 7921, 9409, 10201, 10609, 11449, 11881, 12167, 12769, 16384, 16807, 17161, 18769, 19321, 19683, 22201, 22801, 24389, 24649, 26569]

cp's OEIS Frontend

A065772 Nontrivial prime powers k from A025475 such that tau(k^2) is prime but sigma(k^2) is a composite number.

Table of values

List of values