A113808 - cp's OEIS frontend

A113808 Positive integers n such that S(n) divides n, where S(n) is the sum of the iterates of the Euler phi-function of n, that is, S(n) = phi(n)+phi(phi(n))+....+ 1.

n	a(n)
1	1
2	2
3	3
4	6
5	9
6	15
7	18
8	27
9	30
10	39
11	54
12	78
13	81
14	111
15	162
16	183
17	222
18	243
19	255
20	327
21	363
22	366
23	471
24	486
25	510
26	654
27	726
28	729
29	942
30	1458
31	2187
32	2199
33	3063
34	4359
35	4374
36	4375
37	4398
38	5571
39	6126
40	6561
41	8718
42	8750
43	8751
44	11142
45	13122
46	15723
47	17502
48	19683
49	31446
50	36759

[1, 2, 3, 6, 9, 15, 18, 27, 30, 39, 54, 78, 81, 111, 162, 183, 222, 243, 255, 327, 363, 366, 471, 486, 510, 654, 726, 729, 942, 1458, 2187, 2199, 3063, 4359, 4374, 4375, 4398, 5571, 6126, 6561, 8718, 8750, 8751, 11142, 13122, 15723, 17502, 19683, 31446, 36759]

cp's OEIS Frontend

A113808 Positive integers n such that S(n) divides n, where S(n) is the sum of the iterates of the Euler phi-function of n, that is, S(n) = phi(n)+phi(phi(n))+....+ 1.

Table of values

List of values