A173320 - cp's OEIS frontend

A173320 Numbers k such that tau(sigma(k)) = sopf(k).

n	a(n)
1	2
2	3
3	4
4	15
5	16
6	42
7	45
8	64
9	81
10	84
11	245
12	336
13	340
14	342
15	460
16	539
17	550
18	580
19	605
20	684
21	882
22	1012
23	1014
24	1160
25	1344
26	1360
27	1640
28	1674
29	1700
30	1785
31	1840
32	1972
33	2178
34	2254
35	2320
36	2322
37	2736
38	3096
39	3348
40	3645
41	4048
42	4096
43	4212
44	4332
45	4389
46	4400
47	4644
48	4830
49	5022

[2, 3, 4, 15, 16, 42, 45, 64, 81, 84, 245, 336, 340, 342, 460, 539, 550, 580, 605, 684, 882, 1012, 1014, 1160, 1344, 1360, 1640, 1674, 1700, 1785, 1840, 1972, 2178, 2254, 2320, 2322, 2736, 3096, 3348, 3645, 4048, 4096, 4212, 4332, 4389, 4400, 4644, 4830, 5022]

cp's OEIS Frontend

A173320 Numbers k such that tau(sigma(k)) = sopf(k).

Table of values

List of values