A372665 - cp's OEIS frontend

A372665 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(2jk) / phi(j*k).

n	a(n)
1	1
2	7
3	14
4	28
5	41
6	63
7	82
8	112
9	137
10	175
11	206
12	252
13	289
14	343
15	386
16	448
17	497
18	567
19	622
20	700
21	761
22	847
23	914
24	1008
25	1081
26	1183
27	1262
28	1372
29	1457
30	1575
31	1666
32	1792
33	1889
34	2023
35	2126
36	2268
37	2377
38	2527
39	2642
40	2800
41	2921
42	3087
43	3214
44	3388
45	3521
46	3703
47	3842
48	4032
49	4177
50	4375

[1, 7, 14, 28, 41, 63, 82, 112, 137, 175, 206, 252, 289, 343, 386, 448, 497, 567, 622, 700, 761, 847, 914, 1008, 1081, 1183, 1262, 1372, 1457, 1575, 1666, 1792, 1889, 2023, 2126, 2268, 2377, 2527, 2642, 2800, 2921, 3087, 3214, 3388, 3521, 3703, 3842, 4032, 4177, 4375]

cp's OEIS Frontend

A372665 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(2jk) / phi(j*k).

Table of values

List of values

cp's OEIS Frontend

A372665 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(2*j*k) / phi(j*k).

Table of values

List of values

A372665 a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(2jk) / phi(j*k).