A092585 - cp's OEIS frontend

A092585 Numbers k such that sigma(phi(k))-phi(sigma(k)) is nonzero and is divisible by (k-1), that is A065395(k)/(k-1) = (phi(sigma(k))-sigma(phi(k)))/(k-1) is a nonzero integer.

n	a(n)
1	2
2	4
3	16
4	64
5	151
6	449
7	3403
8	4096
9	4267
10	9307
11	35905
12	65536
13	247285
14	262144
15	17625601
16	33126625
17	399288961
18	649232833
19	947278081
20	1073741824
21	2102485441
22	4555788385
23	5203567081
24	6103058177
25	7115716609

[2, 4, 16, 64, 151, 449, 3403, 4096, 4267, 9307, 35905, 65536, 247285, 262144, 17625601, 33126625, 399288961, 649232833, 947278081, 1073741824, 2102485441, 4555788385, 5203567081, 6103058177, 7115716609]

cp's OEIS Frontend

A092585 Numbers k such that sigma(phi(k))-phi(sigma(k)) is nonzero and is divisible by (k-1), that is A065395(k)/(k-1) = (phi(sigma(k))-sigma(phi(k)))/(k-1) is a nonzero integer.

Table of values

List of values