A124440 - cp's OEIS frontend

A124440 a(n) = Sum_{n/2<=k<=n, gcd(k,n)=1} k.

n	a(n)
1	1
2	1
3	2
4	3
5	7
6	5
7	15
8	12
9	20
10	16
11	40
12	18
13	57
14	33
15	46
16	48
17	100
18	41
19	126
20	60
21	96
22	85
23	187
24	72
25	187
26	120
27	182
28	126
29	301
30	88
31	345
32	192
33	250
34	208
35	318
36	162
37	495
38	261
39	354
40	240
41	610
42	186
43	672
44	330
45	406
46	385
47	805
48	288
49	771
50	376
51	616
52	468
53	1027
54	365
55	830
56	504
57	774
58	616
59	1276

[1, 1, 2, 3, 7, 5, 15, 12, 20, 16, 40, 18, 57, 33, 46, 48, 100, 41, 126, 60, 96, 85, 187, 72, 187, 120, 182, 126, 301, 88, 345, 192, 250, 208, 318, 162, 495, 261, 354, 240, 610, 186, 672, 330, 406, 385, 805, 288, 771, 376, 616, 468, 1027, 365, 830, 504, 774, 616, 1276]

cp's OEIS Frontend

A124440 a(n) = Sum_{n/2<=k<=n, gcd(k,n)=1} k.

Table of values

List of values