A332686 - cp's OEIS frontend

A332686 a(n) = Sum_{k=1..n} phi(k/gcd(n, k)).

n	a(n)
1	1
2	2
3	3
4	5
5	7
6	9
7	13
8	18
9	21
10	23
11	33
12	33
13	47
14	49
15	51
16	67
17	81
18	76
19	103
20	97
21	103
22	119
23	151
24	135
25	163
26	173
27	185
28	189
29	243
30	185
31	279
32	280
33	265
34	299
35	291
36	291
37	397
38	379
39	369
40	371
41	491
42	381
43	543
44	491
45	455
46	553
47	651
48	539
49	653
50	610
51	643
52	683
53	831
54	689
55	743
56	753
57	801
58	887
59	1029

[1, 2, 3, 5, 7, 9, 13, 18, 21, 23, 33, 33, 47, 49, 51, 67, 81, 76, 103, 97, 103, 119, 151, 135, 163, 173, 185, 189, 243, 185, 279, 280, 265, 299, 291, 291, 397, 379, 369, 371, 491, 381, 543, 491, 455, 553, 651, 539, 653, 610, 643, 683, 831, 689, 743, 753, 801, 887, 1029]

cp's OEIS Frontend

A332686 a(n) = Sum_{k=1..n} phi(k/gcd(n, k)).

Table of values

List of values