A291959 - cp's OEIS frontend

A291959 Numbers n such that the arithmetic, geometric and harmonic means of phi(n) and psi(n) are all integers, where phi(n) is the Euler totient function (A000010) and psi(n) is the Dedekind psi function (A001615).

n	a(n)
1	1
2	150
3	300
4	418
5	450
6	525
7	600
8	750
9	836
10	900
11	1200
12	1350
13	1500
14	1575
15	1672
16	1800
17	2250
18	2400
19	2625
20	2700
21	3000
22	3135
23	3344
24	3600
25	3675
26	3750
27	4050
28	4500
29	4598
30	4725
31	4800
32	5400
33	6000
34	6688
35	6750
36	7200
37	7500
38	7875
39	7942
40	8100
41	9000
42	9196
43	9405
44	9600
45	10800

[1, 150, 300, 418, 450, 525, 600, 750, 836, 900, 1200, 1350, 1500, 1575, 1672, 1800, 2250, 2400, 2625, 2700, 3000, 3135, 3344, 3600, 3675, 3750, 4050, 4500, 4598, 4725, 4800, 5400, 6000, 6688, 6750, 7200, 7500, 7875, 7942, 8100, 9000, 9196, 9405, 9600, 10800]

cp's OEIS Frontend

A291959 Numbers n such that the arithmetic, geometric and harmonic means of phi(n) and psi(n) are all integers, where phi(n) is the Euler totient function (A000010) and psi(n) is the Dedekind psi function (A001615).

Table of values

List of values