A348060 - cp's OEIS frontend

A348060 a(n) = Sum_{k=1..n, gcd(n,k) = 1} (k-1) / gcd(n,k-1).

n	a(n)
1	0
2	0
3	1
4	1
5	6
6	2
7	15
8	5
9	15
10	8
11	45
12	7
13	66
14	18
15	30
16	21
17	120
18	18
19	153
20	23
21	70
22	50
23	231
24	24
25	190
26	72
27	147
28	56
29	378
30	40
31	435
32	85
33	194
34	128
35	280
36	55
37	630
38	162
39	284
40	87
41	780
42	68
43	861
44	153
45	264
46	242
47	1035
48	91
49	861
50	200
51	502
52	213
53	1326
54	156
55	788
56	205
57	642
58	392
59	1653
60	110
61	1770
62	450
63	606
64	341
65	1136

[0, 0, 1, 1, 6, 2, 15, 5, 15, 8, 45, 7, 66, 18, 30, 21, 120, 18, 153, 23, 70, 50, 231, 24, 190, 72, 147, 56, 378, 40, 435, 85, 194, 128, 280, 55, 630, 162, 284, 87, 780, 68, 861, 153, 264, 242, 1035, 91, 861, 200, 502, 213, 1326, 156, 788, 205, 642, 392, 1653, 110, 1770, 450, 606, 341, 1136]

cp's OEIS Frontend

A348060 a(n) = Sum_{k=1..n, gcd(n,k) = 1} (k-1) / gcd(n,k-1).

Table of values

List of values