A057919 - cp's OEIS frontend

A057919 Numbers k such that phi(k) divides phi(k+1), where phi(k) is the Euler totient function A000010.

n	a(n)
1	1
2	2
3	3
4	4
5	6
6	12
7	15
8	16
9	18
10	36
11	72
12	90
13	96
14	104
15	108
16	154
17	162
18	164
19	192
20	194
21	255
22	256
23	286
24	364
25	432
26	486
27	495
28	576
29	584
30	702
31	768
32	792
33	804
34	924
35	975
36	1066
37	1152
38	1260
39	1296
40	1458
41	2146
42	2204
43	2592
44	2625
45	2834
46	2916
47	3255
48	3382
49	3456
50	3705
51	3888

[1, 2, 3, 4, 6, 12, 15, 16, 18, 36, 72, 90, 96, 104, 108, 154, 162, 164, 192, 194, 255, 256, 286, 364, 432, 486, 495, 576, 584, 702, 768, 792, 804, 924, 975, 1066, 1152, 1260, 1296, 1458, 2146, 2204, 2592, 2625, 2834, 2916, 3255, 3382, 3456, 3705, 3888]

cp's OEIS Frontend

A057919 Numbers k such that phi(k) divides phi(k+1), where phi(k) is the Euler totient function A000010.

Table of values

List of values