A372635 - cp's OEIS frontend

A372635 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(j)*phi(k).

n	a(n)
1	1
2	4
3	16
4	36
5	100
6	144
7	324
8	484
9	784
10	1024
11	1764
12	2116
13	3364
14	4096
15	5184
16	6400
17	9216
18	10404
19	14400
20	16384
21	19600
22	22500
23	29584
24	32400
25	40000
26	44944
27	52900
28	58564
29	72900
30	77284
31	94864
32	104976
33	118336
34	129600
35	147456
36	156816
37	186624
38	202500
39	224676
40	240100
41	280900

[1, 4, 16, 36, 100, 144, 324, 484, 784, 1024, 1764, 2116, 3364, 4096, 5184, 6400, 9216, 10404, 14400, 16384, 19600, 22500, 29584, 32400, 40000, 44944, 52900, 58564, 72900, 77284, 94864, 104976, 118336, 129600, 147456, 156816, 186624, 202500, 224676, 240100, 280900]

cp's OEIS Frontend

A372635 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(j)*phi(k).

Table of values

List of values