A211778 - cp's OEIS frontend

A211778 Composite numbers n such that Sum_{d_ phi(d_ is an integer, where d_ divisors of n that are less than n, phi(x) = A000010(x).

n	a(n)
1	8
2	12
3	32
4	80
5	81
6	128
7	189
8	196
9	324
10	336
11	448
12	512
13	576
14	768
15	1600
16	1936
17	2025
18	2048
19	2187
20	2500
21	5292
22	5324
23	5616
24	5780
25	8192
26	8748
27	9477
28	11264
29	12096
30	13520
31	14400
32	14800
33	15552
34	15625
35	20736
36	32768
37	35721
38	36864
39	49152
40	53248
41	59049
42	69696
43	73575
44	73872

[8, 12, 32, 80, 81, 128, 189, 196, 324, 336, 448, 512, 576, 768, 1600, 1936, 2025, 2048, 2187, 2500, 5292, 5324, 5616, 5780, 8192, 8748, 9477, 11264, 12096, 13520, 14400, 14800, 15552, 15625, 20736, 32768, 35721, 36864, 49152, 53248, 59049, 69696, 73575, 73872]

cp's OEIS Frontend

A211778 Composite numbers n such that Sum_{d_ phi(d_ is an integer, where d_ divisors of n that are less than n, phi(x) = A000010(x).

Table of values

List of values