A324332 - cp's OEIS frontend

A324332 Numbers m such that A324331(m) = (m-1)^2 - phi(m)*sigma(m) is a square, even though they are not squarefree semiprimes (A006881).

n	a(n)
1	12
2	20
3	24
4	40
5	42
6	44
7	45
8	48
9	63
10	72
11	80
12	96
13	104
14	105
15	108
16	132
17	135
18	160
19	189
20	190
21	192
22	200
23	216
24	275
25	320
26	342
27	384
28	385
29	399
30	405
31	429
32	452
33	456
34	465
35	567
36	575
37	610
38	637
39	639
40	640
41	648
42	693
43	768
44	783
45	848
46	969
47	988
48	1000
49	1015
50	1044
51	1098
52	1105
53	1127
54	1210
55	1215

[12, 20, 24, 40, 42, 44, 45, 48, 63, 72, 80, 96, 104, 105, 108, 132, 135, 160, 189, 190, 192, 200, 216, 275, 320, 342, 384, 385, 399, 405, 429, 452, 456, 465, 567, 575, 610, 637, 639, 640, 648, 693, 768, 783, 848, 969, 988, 1000, 1015, 1044, 1098, 1105, 1127, 1210, 1215]

cp's OEIS Frontend

A324332 Numbers m such that A324331(m) = (m-1)^2 - phi(m)*sigma(m) is a square, even though they are not squarefree semiprimes (A006881).

Table of values

List of values