A372669 - cp's OEIS frontend

A372669 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(njk) / phi(n*k).

n	a(n)
1	1
2	6
3	16
4	37
5	62
6	121
7	154
8	256
9	339
10	499
11	560
12	884
13	910
14	1308
15	1516
16	1870
17	1979
18	2889
19	2756
20	3776
21	4023
22	4814
23	4795
24	6716
25	6330
26	7908
27	8301
28	9946
29	9520
30	13406
31	11587
32	14598
33	15236
34	17508
35	17438
36	22182
37	19518
38	24329
39	24855
40	29063
41	26521
42	35789
43	30577
44	37769

[1, 6, 16, 37, 62, 121, 154, 256, 339, 499, 560, 884, 910, 1308, 1516, 1870, 1979, 2889, 2756, 3776, 4023, 4814, 4795, 6716, 6330, 7908, 8301, 9946, 9520, 13406, 11587, 14598, 15236, 17508, 17438, 22182, 19518, 24329, 24855, 29063, 26521, 35789, 30577, 37769]

cp's OEIS Frontend

A372669 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(njk) / phi(n*k).

Table of values

List of values

cp's OEIS Frontend

A372669 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(n*j*k) / phi(n*k).

Table of values

List of values

A372669 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(njk) / phi(n*k).