A064180 - cp's OEIS frontend

A064180 Composite numbers k such that the sum of the proper divisors of k not including 1, (Chowla's function, A048050) and their product (A007956) are both perfect squares.

n	a(n)
1	117
2	208
3	292
4	320
5	475
6	539
7	549
8	567
9	873
10	964
11	1737
12	2107
13	2692
14	2997
15	3573
16	3904
17	4477
18	4802
19	5275
20	5284
21	5968
22	6057
23	7267
24	7488
25	7492
26	9189
27	9457
28	9475
29	10084
30	10377
31	11072
32	11728
33	11737
34	12717
35	13769
36	14373
37	14692
38	16219
39	16399
40	17397

[117, 208, 292, 320, 475, 539, 549, 567, 873, 964, 1737, 2107, 2692, 2997, 3573, 3904, 4477, 4802, 5275, 5284, 5968, 6057, 7267, 7488, 7492, 9189, 9457, 9475, 10084, 10377, 11072, 11728, 11737, 12717, 13769, 14373, 14692, 16219, 16399, 17397]

cp's OEIS Frontend

A064180 Composite numbers k such that the sum of the proper divisors of k not including 1, (Chowla's function, A048050) and their product (A007956) are both perfect squares.

Table of values

List of values