A371628 - cp's OEIS frontend

A371628 a(n) = Sum_{1 <= x_1, x_2, x_3, x_4 <= n} ( gcd(x_1, n)/gcd(x_1, x_2, x_3, x_4, n) )^3.

n	a(n)
1	1
2	65
3	757
4	4225
5	16001
6	49205
7	119365
8	271489
9	554797
10	1040065
11	1783541
12	3198325
13	4850977
14	7758725
15	12112757
16	17392769
17	24211265
18	36061805
19	47162485
20	67604225
21	90359305
22	115930165
23	148291397
24	205517173
25	250266001
26	315313505
27	404686153
28	504317125
29	595481825

[1, 65, 757, 4225, 16001, 49205, 119365, 271489, 554797, 1040065, 1783541, 3198325, 4850977, 7758725, 12112757, 17392769, 24211265, 36061805, 47162485, 67604225, 90359305, 115930165, 148291397, 205517173, 250266001, 315313505, 404686153, 504317125, 595481825]

cp's OEIS Frontend

A371628 a(n) = Sum_{1 <= x_1, x_2, x_3, x_4 <= n} ( gcd(x_1, n)/gcd(x_1, x_2, x_3, x_4, n) )^3.

Table of values

List of values