A134601 - cp's OEIS frontend

A134601 Composite numbers such that the square mean of their prime factors is a prime (where the prime factors are taken with multiplicity and the square mean of c and d is sqrt((c^2+d^2)/2)).

n	a(n)
1	4
2	8
3	9
4	16
5	25
6	27
7	32
8	49
9	64
10	81
11	119
12	121
13	125
14	128
15	161
16	169
17	243
18	256
19	289
20	343
21	351
22	361
23	512
24	529
25	595
26	625
27	721
28	729
29	841
30	845
31	959
32	961
33	1024
34	1045
35	1081
36	1241
37	1323
38	1331
39	1369
40	1375
41	1547
42	1681
43	1792
44	1849
45	1855
46	2048
47	2187
48	2197
49	2209
50	2401

[4, 8, 9, 16, 25, 27, 32, 49, 64, 81, 119, 121, 125, 128, 161, 169, 243, 256, 289, 343, 351, 361, 512, 529, 595, 625, 721, 729, 841, 845, 959, 961, 1024, 1045, 1081, 1241, 1323, 1331, 1369, 1375, 1547, 1681, 1792, 1849, 1855, 2048, 2187, 2197, 2209, 2401]

cp's OEIS Frontend

A134601 Composite numbers such that the square mean of their prime factors is a prime (where the prime factors are taken with multiplicity and the square mean of c and d is sqrt((c^2+d^2)/2)).

Table of values

List of values