A053818 - cp's OEIS frontend

A053818 a(n) = Sum_{k=1..n, gcd(n,k) = 1} k^2.

n	a(n)
1	1
2	1
3	5
4	10
5	30
6	26
7	91
8	84
9	159
10	140
11	385
12	196
13	650
14	406
15	620
16	680
17	1496
18	654
19	2109
20	1080
21	1806
22	1650
23	3795
24	1544
25	4150
26	2756
27	4365
28	3164
29	7714
30	2360
31	9455
32	5456
33	7370
34	6256
35	9940
36	5196
37	16206
38	8778
39	12324
40	8560
41	22140
42	6972
43	25585

[1, 1, 5, 10, 30, 26, 91, 84, 159, 140, 385, 196, 650, 406, 620, 680, 1496, 654, 2109, 1080, 1806, 1650, 3795, 1544, 4150, 2756, 4365, 3164, 7714, 2360, 9455, 5456, 7370, 6256, 9940, 5196, 16206, 8778, 12324, 8560, 22140, 6972, 25585]

cp's OEIS Frontend

A053818 a(n) = Sum_{k=1..n, gcd(n,k) = 1} k^2.

Table of values

List of values