A372668 - cp's OEIS frontend

A372668 a(n) = (1/phi(n)) * Sum_{j=1..n} Sum_{k=1..n} phi(njk).

n	a(n)
1	1
2	9
3	26
4	83
5	132
6	404
7	400
8	989
9	1199
10	2382
11	2096
12	5381
13	3922
14	8358
15	8525
16	12897
17	10758
18	25517
19	16618
20	34116
21	30217
22	45156
23	34224
24	77503
25	50559
26	87512
27	77328
28	119162
29	84364
30	198907
31	108928
32	196605
33	174258
34	249884
35	195499
36	374490
37	215930
38	386822
39	330878
40	500717

[1, 9, 26, 83, 132, 404, 400, 989, 1199, 2382, 2096, 5381, 3922, 8358, 8525, 12897, 10758, 25517, 16618, 34116, 30217, 45156, 34224, 77503, 50559, 87512, 77328, 119162, 84364, 198907, 108928, 196605, 174258, 249884, 195499, 374490, 215930, 386822, 330878, 500717]

cp's OEIS Frontend

A372668 a(n) = (1/phi(n)) * Sum_{j=1..n} Sum_{k=1..n} phi(njk).

Table of values

List of values

cp's OEIS Frontend

A372668 a(n) = (1/phi(n)) * Sum_{j=1..n} Sum_{k=1..n} phi(n*j*k).

Table of values

List of values

A372668 a(n) = (1/phi(n)) * Sum_{j=1..n} Sum_{k=1..n} phi(njk).