A073540 - cp's OEIS frontend

A073540 Composite numbers k such that k/phi(k) - sigma(k)/k has numerator equal to 1.

n	a(n)
1	4
2	6
3	8
4	9
5	16
6	24
7	25
8	27
9	28
10	32
11	40
12	49
13	64
14	81
15	121
16	125
17	128
18	169
19	224
20	243
21	256
22	289
23	343
24	360
25	361
26	496
27	512
28	529
29	625
30	672
31	729
32	841
33	864
34	936
35	961
36	1024
37	1331
38	1369
39	1681
40	1849
41	2016
42	2048
43	2176
44	2187
45	2197
46	2209
47	2401
48	2809
49	3125
50	3481
51	3721
52	4096

[4, 6, 8, 9, 16, 24, 25, 27, 28, 32, 40, 49, 64, 81, 121, 125, 128, 169, 224, 243, 256, 289, 343, 360, 361, 496, 512, 529, 625, 672, 729, 841, 864, 936, 961, 1024, 1331, 1369, 1681, 1849, 2016, 2048, 2176, 2187, 2197, 2209, 2401, 2809, 3125, 3481, 3721, 4096]

cp's OEIS Frontend

A073540 Composite numbers k such that k/phi(k) - sigma(k)/k has numerator equal to 1.

Table of values

List of values