A189057 - cp's OEIS frontend

A189057 Numbers n for which phi(n)=sigma(n'), where phi is the Euler totient function, sigma is the sum of divisors and n' the arithmetic derivative of n.

n	a(n)
1	2
2	57
3	175
4	357
5	381
6	543
7	777
8	903
9	2379
10	3027
11	6807
12	25823
13	47047
14	74333
15	82621
16	136213
17	153425
18	163471
19	194873
20	230547
21	257799
22	259555
23	265111
24	269545
25	285439
26	289009
27	302403
28	305305
29	311395
30	354365
31	416005
32	484169
33	569245
34	718333
35	755885
36	781501
37	1012505

[2, 57, 175, 357, 381, 543, 777, 903, 2379, 3027, 6807, 25823, 47047, 74333, 82621, 136213, 153425, 163471, 194873, 230547, 257799, 259555, 265111, 269545, 285439, 289009, 302403, 305305, 311395, 354365, 416005, 484169, 569245, 718333, 755885, 781501, 1012505]

cp's OEIS Frontend

A189057 Numbers n for which phi(n)=sigma(n'), where phi is the Euler totient function, sigma is the sum of divisors and n' the arithmetic derivative of n.

Table of values

List of values