A055638 - cp's OEIS frontend

A055638 Numbers k for which sigma(k^2) is prime.

n	a(n)
1	2
2	3
3	4
4	5
5	8
6	17
7	27
8	41
9	49
10	59
11	64
12	71
13	89
14	101
15	125
16	131
17	167
18	169
19	173
20	256
21	289
22	293
23	383
24	512
25	529
26	677
27	701
28	729
29	743
30	761
31	773
32	827
33	839
34	841
35	857
36	911
37	1091
38	1097
39	1163
40	1181
41	1193
42	1217
43	1373
44	1427
45	1487
46	1559
47	1583
48	1709
49	1811
50	1847
51	1849
52	1931

[2, 3, 4, 5, 8, 17, 27, 41, 49, 59, 64, 71, 89, 101, 125, 131, 167, 169, 173, 256, 289, 293, 383, 512, 529, 677, 701, 729, 743, 761, 773, 827, 839, 841, 857, 911, 1091, 1097, 1163, 1181, 1193, 1217, 1373, 1427, 1487, 1559, 1583, 1709, 1811, 1847, 1849, 1931]

cp's OEIS Frontend

A055638 Numbers k for which sigma(k^2) is prime.

Table of values

List of values