A332049 - cp's OEIS frontend

A332049 a(n) = (1/2) * Sum_{d|n, d > 1} d * phi(d).

n	a(n)
1	0
2	1
3	3
4	5
5	10
6	10
7	21
8	21
9	30
10	31
11	55
12	38
13	78
14	64
15	73
16	85
17	136
18	91
19	171
20	115
21	150
22	166
23	253
24	150
25	260
26	235
27	273
28	236
29	406
30	220
31	465
32	341
33	388
34	409
35	451
36	335
37	666
38	514
39	549
40	451
41	820
42	451
43	903
44	610
45	640
46	760
47	1081
48	598
49	1050
50	781
51	955
52	863
53	1378
54	820
55	1165

[0, 1, 3, 5, 10, 10, 21, 21, 30, 31, 55, 38, 78, 64, 73, 85, 136, 91, 171, 115, 150, 166, 253, 150, 260, 235, 273, 236, 406, 220, 465, 341, 388, 409, 451, 335, 666, 514, 549, 451, 820, 451, 903, 610, 640, 760, 1081, 598, 1050, 781, 955, 863, 1378, 820, 1165]

cp's OEIS Frontend

A332049 a(n) = (1/2) * Sum_{d|n, d > 1} d * phi(d).

Table of values

List of values