A332794 - cp's OEIS frontend

A332794 a(n) = Sum_{d|n} (-1)^(d + 1) * d * phi(n/d).

n	a(n)
1	1
2	-1
3	5
4	-4
5	9
6	-5
7	13
8	-12
9	21
10	-9
11	21
12	-20
13	25
14	-13
15	45
16	-32
17	33
18	-21
19	37
20	-36
21	65
22	-21
23	45
24	-60
25	65
26	-25
27	81
28	-52
29	57
30	-45
31	61
32	-80
33	105
34	-33
35	117
36	-84
37	73
38	-37
39	125
40	-108
41	81
42	-65
43	85
44	-84
45	189
46	-45
47	93
48	-160
49	133
50	-65
51	165
52	-100
53	105
54	-81
55	189

[1, -1, 5, -4, 9, -5, 13, -12, 21, -9, 21, -20, 25, -13, 45, -32, 33, -21, 37, -36, 65, -21, 45, -60, 65, -25, 81, -52, 57, -45, 61, -80, 105, -33, 117, -84, 73, -37, 125, -108, 81, -65, 85, -84, 189, -45, 93, -160, 133, -65, 165, -100, 105, -81, 189]

cp's OEIS Frontend

A332794 a(n) = Sum_{d|n} (-1)^(d + 1) * d * phi(n/d).

Table of values

List of values