A239612 - cp's OEIS frontend

A239612 a(n) = Sum_{0 < x,y,z <= n and gcd(x^2 + y^2 + z^2, n)=1} gcd(x^2 + y^2 + z^2 - 1, n).

n	a(n)
1	1
2	8
3	30
4	112
5	220
6	240
7	546
8	1280
9	1134
10	1760
11	2310
12	3360
13	4212
14	4368
15	6600
16	13312
17	9520
18	9072
19	12654
20	24640
21	16380
22	18480
23	22770
24	38400
25	42500
26	33696
27	39366
28	61152
29	47908
30	52800
31	56730
32	131072
33	69300
34	76160
35	120120
36	127008
37	99900
38	101232
39	126360
40	281600

[1, 8, 30, 112, 220, 240, 546, 1280, 1134, 1760, 2310, 3360, 4212, 4368, 6600, 13312, 9520, 9072, 12654, 24640, 16380, 18480, 22770, 38400, 42500, 33696, 39366, 61152, 47908, 52800, 56730, 131072, 69300, 76160, 120120, 127008, 99900, 101232, 126360, 281600]

cp's OEIS Frontend

A239612 a(n) = Sum_{0 < x,y,z <= n and gcd(x^2 + y^2 + z^2, n)=1} gcd(x^2 + y^2 + z^2 - 1, n).

Table of values

List of values