A373061 - cp's OEIS frontend

A373061 a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} gcd(x_1, x_2, n)/gcd(x_1, x_2, x_3, n).

n	a(n)
1	1
2	9
3	31
4	77
5	141
6	279
7	379
8	637
9	877
10	1269
11	1431
12	2387
13	2341
14	3411
15	4371
16	5181
17	5169
18	7893
19	7183
20	10857
21	11749
22	12879
23	12651
24	19747
25	18041
26	21069
27	24043
28	29183
29	25173
30	39339
31	30691
32	41789
33	44361
34	46521
35	53439
36	67529
37	51949
38	64647
39	72571
40	89817
41	70521
42	105741

[1, 9, 31, 77, 141, 279, 379, 637, 877, 1269, 1431, 2387, 2341, 3411, 4371, 5181, 5169, 7893, 7183, 10857, 11749, 12879, 12651, 19747, 18041, 21069, 24043, 29183, 25173, 39339, 30691, 41789, 44361, 46521, 53439, 67529, 51949, 64647, 72571, 89817, 70521, 105741]

cp's OEIS Frontend

A373061 a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} gcd(x_1, x_2, n)/gcd(x_1, x_2, x_3, n).

Table of values

List of values