A091286 - cp's OEIS frontend

A091286 Numbers n such that sigma_3(n) is divisible by square of cototient of n, while n is not a prime number.

n	a(n)
1	15
2	85
3	259
4	295
5	391
6	589
7	799
8	1111
9	1717
10	3193
11	4171
12	4369
13	12361
14	17473
15	23533
16	25429
17	28243
18	31351
19	34477
20	36181
21	41407
22	47989
23	51143
24	52537
25	58103
26	65641
27	68377
28	69541
29	69919
30	70453
31	72619
32	81121
33	83131
34	83767
35	85069
36	91759

[15, 85, 259, 295, 391, 589, 799, 1111, 1717, 3193, 4171, 4369, 12361, 17473, 23533, 25429, 28243, 31351, 34477, 36181, 41407, 47989, 51143, 52537, 58103, 65641, 68377, 69541, 69919, 70453, 72619, 81121, 83131, 83767, 85069, 91759]

cp's OEIS Frontend

A091286 Numbers n such that sigma_3(n) is divisible by square of cototient of n, while n is not a prime number.

Table of values

List of values