A024916 - cp's OEIS frontend

A024916 a(n) = Sum_{k=1..n} k*floor(n/k); also Sum_{k=1..n} sigma(k) where sigma(n) = sum of divisors of n (A000203).

n	a(n)
1	1
2	4
3	8
4	15
5	21
6	33
7	41
8	56
9	69
10	87
11	99
12	127
13	141
14	165
15	189
16	220
17	238
18	277
19	297
20	339
21	371
22	407
23	431
24	491
25	522
26	564
27	604
28	660
29	690
30	762
31	794
32	857
33	905
34	959
35	1007
36	1098
37	1136
38	1196
39	1252
40	1342
41	1384
42	1480
43	1524
44	1608
45	1686
46	1758
47	1806
48	1930
49	1987
50	2080
51	2152

[1, 4, 8, 15, 21, 33, 41, 56, 69, 87, 99, 127, 141, 165, 189, 220, 238, 277, 297, 339, 371, 407, 431, 491, 522, 564, 604, 660, 690, 762, 794, 857, 905, 959, 1007, 1098, 1136, 1196, 1252, 1342, 1384, 1480, 1524, 1608, 1686, 1758, 1806, 1930, 1987, 2080, 2152]

cp's OEIS Frontend

A024916 a(n) = Sum_{k=1..n} k*floor(n/k); also Sum_{k=1..n} sigma(k) where sigma(n) = sum of divisors of n (A000203).

Table of values

List of values