A072481 - cp's OEIS frontend

A072481 a(n) = Sum_{k=1..n} Sum_{d=1..k} (k mod d).

n	a(n)
0	0
1	0
2	0
3	1
4	2
5	6
6	9
7	17
8	25
9	37
10	50
11	72
12	89
13	117
14	148
15	184
16	220
17	271
18	318
19	382
20	443
21	513
22	590
23	688
24	773
25	876
26	988
27	1113
28	1237
29	1388
30	1526
31	1693
32	1860
33	2044
34	2241
35	2459
36	2657
37	2890
38	3138
39	3407
40	3665
41	3962
42	4246
43	4571
44	4899
45	5238
46	5596
47	5999
48	6373
49	6787
50	7207

[0, 0, 0, 1, 2, 6, 9, 17, 25, 37, 50, 72, 89, 117, 148, 184, 220, 271, 318, 382, 443, 513, 590, 688, 773, 876, 988, 1113, 1237, 1388, 1526, 1693, 1860, 2044, 2241, 2459, 2657, 2890, 3138, 3407, 3665, 3962, 4246, 4571, 4899, 5238, 5596, 5999, 6373, 6787, 7207]

cp's OEIS Frontend

A072481 a(n) = Sum_{k=1..n} Sum_{d=1..k} (k mod d).

Table of values

List of values