A372906 - cp's OEIS frontend

A372906 a(n) = Sum_{j=1..n} Sum_{k=1..n} gcd(j,n) * gcd(k,n) / gcd(j*k,n).

n	a(n)
1	1
2	5
3	11
4	21
5	29
6	55
7	55
8	82
9	97
10	145
11	131
12	231
13	181
14	275
15	319
16	312
17	305
18	485
19	379
20	609
21	605
22	655
23	551
24	902
25	681
26	905
27	819
28	1155
29	869
30	1595
31	991
32	1184
33	1441
34	1525
35	1595
36	2037
37	1405
38	1895
39	1991
40	2378
41	1721
42	3025
43	1891
44	2751
45	2813
46	2755
47	2255
48	3432
49	2521
50	3405
51	3355

[1, 5, 11, 21, 29, 55, 55, 82, 97, 145, 131, 231, 181, 275, 319, 312, 305, 485, 379, 609, 605, 655, 551, 902, 681, 905, 819, 1155, 869, 1595, 991, 1184, 1441, 1525, 1595, 2037, 1405, 1895, 1991, 2378, 1721, 3025, 1891, 2751, 2813, 2755, 2255, 3432, 2521, 3405, 3355]

cp's OEIS Frontend

A372906 a(n) = Sum_{j=1..n} Sum_{k=1..n} gcd(j,n) * gcd(k,n) / gcd(j*k,n).

Table of values

List of values