A373582 - cp's OEIS frontend

A373582 a(n) = Sum_{k=1..n} Sum_{z=1..n} Sum_{y=1..n} Sum_{x=1..n} [GCD(f(x,y,z), n) = k] * f(x,y,z) * A023900(k), where f(x,y,z) = x^2 + y^2 - z^2.

n	a(n)
1	1
2	0
3	-117
4	0
5	-350
6	0
7	-4263
8	0
9	-7533
10	0
11	-27225
12	0
13	-17914
14	0
15	62100
16	0
17	-53176
18	0
19	-250173
20	0
21	83790
22	0
23	-541167
24	0
25	-168750
26	0
27	-557685
28	0
29	-459186
30	0
31	-1801875
32	0
33	533610
34	0
35	2249100
36	0
37	-1223886
38	0
39	3157596
40	0
41	-1849100
42	0
43	-6717417
44	0
45	3863700
46	0
47	-9602523

[1, 0, -117, 0, -350, 0, -4263, 0, -7533, 0, -27225, 0, -17914, 0, 62100, 0, -53176, 0, -250173, 0, 83790, 0, -541167, 0, -168750, 0, -557685, 0, -459186, 0, -1801875, 0, 533610, 0, 2249100, 0, -1223886, 0, 3157596, 0, -1849100, 0, -6717417, 0, 3863700, 0, -9602523]

cp's OEIS Frontend

A373582 a(n) = Sum_{k=1..n} Sum_{z=1..n} Sum_{y=1..n} Sum_{x=1..n} [GCD(f(x,y,z), n) = k] * f(x,y,z) * A023900(k), where f(x,y,z) = x^2 + y^2 - z^2.

Table of values

List of values