A373132 - cp's OEIS frontend

A373132 a(n) = Sum_{1 <= x_1, x_2 <= n} sigma( ( n/gcd(x_1, x_2, n) )^2 ).

n	a(n)
1	1
2	22
3	105
4	394
5	745
6	2310
7	2737
8	6490
9	8817
10	16390
11	15961
12	41370
13	30745
14	60214
15	78225
16	104602
17	88417
18	193974
19	137161
20	293530
21	287385
22	351142
23	291985
24	681450
25	469345
26	676390
27	717081
28	1078378
29	731641
30	1720950
31	953281
32	1676698
33	1675905
34	1945174
35	2039065
36	3473898

[1, 22, 105, 394, 745, 2310, 2737, 6490, 8817, 16390, 15961, 41370, 30745, 60214, 78225, 104602, 88417, 193974, 137161, 293530, 287385, 351142, 291985, 681450, 469345, 676390, 717081, 1078378, 731641, 1720950, 953281, 1676698, 1675905, 1945174, 2039065, 3473898]

cp's OEIS Frontend

A373132 a(n) = Sum_{1 <= x_1, x_2 <= n} sigma( ( n/gcd(x_1, x_2, n) )^2 ).

Table of values

List of values