A037197 - cp's OEIS frontend

A037197 Numbers k such that tau(sigma(k)) = tau(k) where tau(k) is the number of divisors of k and sigma(k) their sum.

n	a(n)
1	1
2	2
3	8
4	12
5	32
6	52
7	75
8	84
9	90
10	98
11	128
12	150
13	156
14	338
15	360
16	392
17	525
18	528
19	560
20	600
21	722
22	867
23	912
24	972
25	1050
26	1352
27	1452
28	1456
29	1525
30	1734
31	1922
32	2064
33	2160
34	2340
35	2400
36	2888
37	2890
38	3050
39	3120
40	3216
41	3698
42	3744
43	3872
44	4080
45	4144
46	4200
47	4500
48	4575

[1, 2, 8, 12, 32, 52, 75, 84, 90, 98, 128, 150, 156, 338, 360, 392, 525, 528, 560, 600, 722, 867, 912, 972, 1050, 1352, 1452, 1456, 1525, 1734, 1922, 2064, 2160, 2340, 2400, 2888, 2890, 3050, 3120, 3216, 3698, 3744, 3872, 4080, 4144, 4200, 4500, 4575]

cp's OEIS Frontend

A037197 Numbers k such that tau(sigma(k)) = tau(k) where tau(k) is the number of divisors of k and sigma(k) their sum.

Table of values

List of values