A371492 - cp's OEIS frontend

A371492 a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} ( gcd(x_1, n)/gcd(x_1, x_2, x_3, n) )^2.

n	a(n)
1	1
2	17
3	91
4	289
5	701
6	1547
7	2647
8	4769
9	7705
10	11917
11	15731
12	26299
13	30421
14	44999
15	63791
16	77473
17	87857
18	130985
19	136459
20	202589
21	240877
22	267427
23	290951
24	433979
25	448201
26	517157
27	633187
28	764983
29	729989
30	1084447
31	951391
32	1248929
33	1431521
34	1493569
35	1855547
36	2226745

[1, 17, 91, 289, 701, 1547, 2647, 4769, 7705, 11917, 15731, 26299, 30421, 44999, 63791, 77473, 87857, 130985, 136459, 202589, 240877, 267427, 290951, 433979, 448201, 517157, 633187, 764983, 729989, 1084447, 951391, 1248929, 1431521, 1493569, 1855547, 2226745]

cp's OEIS Frontend

A371492 a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} ( gcd(x_1, n)/gcd(x_1, x_2, x_3, n) )^2.

Table of values

List of values