A372664 - cp's OEIS frontend

A372664 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(2jk) / phi(k).

n	a(n)
1	1
2	9
3	21
4	55
5	93
6	163
7	241
8	383
9	507
10	709
11	915
12	1205
13	1497
14	1907
15	2220
16	2794
17	3306
18	3966
19	4610
20	5438
21	6075
22	7113
23	8067
24	9245
25	10272
26	11742
27	12900
28	14552
29	16086
30	17798
31	19552
32	21894
33	23532
34	26082
35	27933
36	30589
37	33105
38	36307
39	38619
40	41945
41	45049
42	48459
43	51875

[1, 9, 21, 55, 93, 163, 241, 383, 507, 709, 915, 1205, 1497, 1907, 2220, 2794, 3306, 3966, 4610, 5438, 6075, 7113, 8067, 9245, 10272, 11742, 12900, 14552, 16086, 17798, 19552, 21894, 23532, 26082, 27933, 30589, 33105, 36307, 38619, 41945, 45049, 48459, 51875]

cp's OEIS Frontend

A372664 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(2jk) / phi(k).

Table of values

List of values

cp's OEIS Frontend

A372664 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(2*j*k) / phi(k).

Table of values

List of values

A372664 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(2jk) / phi(k).