A368740 - cp's OEIS frontend

A368740 a(n) = Sum_{k = 1..n} gcd(5*k, n).

n	a(n)
1	1
2	3
3	5
4	8
5	25
6	15
7	13
8	20
9	21
10	75
11	21
12	40
13	25
14	39
15	125
16	48
17	33
18	63
19	37
20	200
21	65
22	63
23	45
24	100
25	225
26	75
27	81
28	104
29	57
30	375
31	61
32	112
33	105
34	99
35	325
36	168
37	73
38	111
39	125
40	500
41	81
42	195
43	85
44	168
45	525
46	135
47	93
48	240
49	133
50	675
51	165
52	200
53	105
54	243
55	525
56	260
57	185
58	171
59	117
60	1000
61	121
62	183
63	273
64	256
65	625

[1, 3, 5, 8, 25, 15, 13, 20, 21, 75, 21, 40, 25, 39, 125, 48, 33, 63, 37, 200, 65, 63, 45, 100, 225, 75, 81, 104, 57, 375, 61, 112, 105, 99, 325, 168, 73, 111, 125, 500, 81, 195, 85, 168, 525, 135, 93, 240, 133, 675, 165, 200, 105, 243, 525, 260, 185, 171, 117, 1000, 121, 183, 273, 256, 625]

cp's OEIS Frontend

A368740 a(n) = Sum_{k = 1..n} gcd(5*k, n).

Table of values

List of values