A190402 - cp's OEIS frontend

A190402 Number n for which phi(n) = phi(n'), where phi is the Euler totient function and n' the arithmetic derivative of n.

n	a(n)
1	2
2	4
3	8
4	14
5	20
6	27
7	45
8	52
9	75
10	148
11	195
12	244
13	292
14	364
15	628
16	729
17	772
18	1108
19	1196
20	1215
21	1252
22	1406
23	1552
24	1588
25	1684
26	1701
27	1828
28	2164
29	2452
30	2644
31	2692
32	2924
33	2932
34	3028
35	3125
36	3508
37	3825
38	3982
39	3988
40	4372
41	4462
42	4612
43	4804
44	4852
45	4948
46	5284
47	5524

[2, 4, 8, 14, 20, 27, 45, 52, 75, 148, 195, 244, 292, 364, 628, 729, 772, 1108, 1196, 1215, 1252, 1406, 1552, 1588, 1684, 1701, 1828, 2164, 2452, 2644, 2692, 2924, 2932, 3028, 3125, 3508, 3825, 3982, 3988, 4372, 4462, 4612, 4804, 4852, 4948, 5284, 5524]

cp's OEIS Frontend

A190402 Number n for which phi(n) = phi(n'), where phi is the Euler totient function and n' the arithmetic derivative of n.

Table of values

List of values