A343803 - cp's OEIS frontend

A343803 a(n) = Sum_{k=1..n} k * (number of divisors of n <= k).

n	a(n)
1	1
2	5
3	9
4	23
5	20
6	65
7	35
8	109
9	96
10	164
11	77
12	377
13	104
14	307
15	362
16	525
17	170
18	818
19	209
20	1008
21	690
22	725
23	299
24	2005
25	665
26	1000
27	1122
28	1939
29	464
30	3106
31	527
32	2517
33	1658
34	1682
35	1894
36	5084
37	740
38	2089
39	2298
40	5500
41	902
42	6022
43	989
44	4701
45	5066
46	3035
47	1175
48	10117
49	2478
50	6069
51	3890
52	6532
53	1484

[1, 5, 9, 23, 20, 65, 35, 109, 96, 164, 77, 377, 104, 307, 362, 525, 170, 818, 209, 1008, 690, 725, 299, 2005, 665, 1000, 1122, 1939, 464, 3106, 527, 2517, 1658, 1682, 1894, 5084, 740, 2089, 2298, 5500, 902, 6022, 989, 4701, 5066, 3035, 1175, 10117, 2478, 6069, 3890, 6532, 1484]

cp's OEIS Frontend

A343803 a(n) = Sum_{k=1..n} k * (number of divisors of n <= k).

Table of values

List of values