A372931 - cp's OEIS frontend

A372931 a(n) = Sum_{1 <= x_1, x_2, x_3, x_4 <= n} gcd(x_1, x_2, x_3, x_4, n)^4.

n	a(n)
1	1
2	31
3	161
4	736
5	1249
6	4991
7	4801
8	15616
9	19521
10	38719
11	29281
12	118496
13	57121
14	148831
15	201089
16	311296
17	167041
18	605151
19	260641
20	919264
21	772961
22	907711
23	559681
24	2514176
25	1170625
26	1770751
27	2106081
28	3533536
29	1414561
30	6233759
31	1847041
32	5963776
33	4714241
34	5178271
35	5996449

[1, 31, 161, 736, 1249, 4991, 4801, 15616, 19521, 38719, 29281, 118496, 57121, 148831, 201089, 311296, 167041, 605151, 260641, 919264, 772961, 907711, 559681, 2514176, 1170625, 1770751, 2106081, 3533536, 1414561, 6233759, 1847041, 5963776, 4714241, 5178271, 5996449]

cp's OEIS Frontend

A372931 a(n) = Sum_{1 <= x_1, x_2, x_3, x_4 <= n} gcd(x_1, x_2, x_3, x_4, n)^4.

Table of values

List of values