A323917 - cp's OEIS frontend

A323917 Numbers k with exactly two distinct prime divisors and such that cototient(k) is square, where k = p^(2s+1) * q^(2t+1) with s,t >=0, p, q primes and p + q - 1 = M^2.

n	a(n)
1	6
2	21
3	24
4	54
5	69
6	96
7	133
8	141
9	189
10	216
11	237
12	301
13	384
14	481
15	486
16	501
17	589
18	621
19	669
20	781
21	864
22	1029
23	1077
24	1141
25	1269
26	1317
27	1357
28	1417
29	1536
30	1537
31	1701
32	1944
33	1957
34	1981
35	2041
36	2133
37	2181
38	2517
39	2869
40	3261
41	3397
42	3456
43	3601
44	3661
45	3669
46	4101
47	4309
48	4333
49	4374
50	4509

[6, 21, 24, 54, 69, 96, 133, 141, 189, 216, 237, 301, 384, 481, 486, 501, 589, 621, 669, 781, 864, 1029, 1077, 1141, 1269, 1317, 1357, 1417, 1536, 1537, 1701, 1944, 1957, 1981, 2041, 2133, 2181, 2517, 2869, 3261, 3397, 3456, 3601, 3661, 3669, 4101, 4309, 4333, 4374, 4509]

cp's OEIS Frontend

A323917 Numbers k with exactly two distinct prime divisors and such that cototient(k) is square, where k = p^(2s+1) * q^(2t+1) with s,t >=0, p, q primes and p + q - 1 = M^2.

Table of values

List of values