A372663 - cp's OEIS frontend

A372663 a(n) = Sum_{i=1..n} Sum_{j=1..n} Sum_{k=1..n} phi(ijk) / phi(j*k).

n	a(n)
1	1
2	11
3	46
4	139
5	316
6	633
7	1138
8	1947
9	3060
10	4583
11	6660
12	9367
13	12856
14	17153
15	22169
16	28886
17	36843
18	46179
19	57402
20	70096
21	84177
22	101268
23	121333
24	143664
25	168513
26	197084
27	228759
28	263965
29	304686
30	346832
31	396697
32	452114
33	508358
34	573205
35	638715
36	714691
37	799950
38	890893
39	984275

[1, 11, 46, 139, 316, 633, 1138, 1947, 3060, 4583, 6660, 9367, 12856, 17153, 22169, 28886, 36843, 46179, 57402, 70096, 84177, 101268, 121333, 143664, 168513, 197084, 228759, 263965, 304686, 346832, 396697, 452114, 508358, 573205, 638715, 714691, 799950, 890893, 984275]

cp's OEIS Frontend

A372663 a(n) = Sum_{i=1..n} Sum_{j=1..n} Sum_{k=1..n} phi(ijk) / phi(j*k).

Table of values

List of values

cp's OEIS Frontend

A372663 a(n) = Sum_{i=1..n} Sum_{j=1..n} Sum_{k=1..n} phi(i*j*k) / phi(j*k).

Table of values

List of values

A372663 a(n) = Sum_{i=1..n} Sum_{j=1..n} Sum_{k=1..n} phi(ijk) / phi(j*k).