A069153 - cp's OEIS frontend

A069153 a(n) = Sum_{d|n} d*(d-1)/2.

n	a(n)
1	0
2	1
3	3
4	7
5	10
6	19
7	21
8	35
9	39
10	56
11	55
12	91
13	78
14	113
15	118
16	155
17	136
18	208
19	171
20	252
21	234
22	287
23	253
24	395
25	310
26	404
27	390
28	497
29	406
30	614
31	465
32	651
33	586
34	698
35	626
36	910
37	666
38	875
39	822
40	1060
41	820
42	1202
43	903
44	1239
45	1144
46	1289
47	1081
48	1643
49	1197
50	1581
51	1414
52	1736

[0, 1, 3, 7, 10, 19, 21, 35, 39, 56, 55, 91, 78, 113, 118, 155, 136, 208, 171, 252, 234, 287, 253, 395, 310, 404, 390, 497, 406, 614, 465, 651, 586, 698, 626, 910, 666, 875, 822, 1060, 820, 1202, 903, 1239, 1144, 1289, 1081, 1643, 1197, 1581, 1414, 1736]

cp's OEIS Frontend

A069153 a(n) = Sum_{d|n} d*(d-1)/2.

Table of values

List of values