A336687 - cp's OEIS frontend

A336687 Numbers m such that tau(sigma(m)) and sigma(tau(m)) both divide m, where tau(m) is the number of divisors function (A000005) and sigma(m) is the sum of divisors function (A000203).

n	a(n)
1	1
2	3
3	4
4	12
5	64
6	84
7	140
8	144
9	162
10	192
11	336
12	360
13	420
14	468
15	480
16	576
17	600
18	644
19	720
20	780
21	1008
22	1344
23	1512
24	1584
25	1600
26	1740
27	1872
28	2160
29	2240
30	2448
31	2592
32	2736
33	2880
34	2884
35	3136
36	3240
37	3888
38	4032
39	4158
40	4228
41	4464
42	4608
43	4800
44	5040
45	5115
46	5184
47	5328
48	5670
49	6060
50	6192
51	6336

[1, 3, 4, 12, 64, 84, 140, 144, 162, 192, 336, 360, 420, 468, 480, 576, 600, 644, 720, 780, 1008, 1344, 1512, 1584, 1600, 1740, 1872, 2160, 2240, 2448, 2592, 2736, 2880, 2884, 3136, 3240, 3888, 4032, 4158, 4228, 4464, 4608, 4800, 5040, 5115, 5184, 5328, 5670, 6060, 6192, 6336]

cp's OEIS Frontend

A336687 Numbers m such that tau(sigma(m)) and sigma(tau(m)) both divide m, where tau(m) is the number of divisors function (A000005) and sigma(m) is the sum of divisors function (A000203).

Table of values

List of values