A356042 - cp's OEIS frontend

A356042 a(n) = Sum_{k=1..n} sigma_2(k) * floor(n/k).

n	a(n)
1	1
2	7
3	18
4	45
5	72
6	138
7	189
8	301
9	403
10	565
11	688
12	985
13	1156
14	1462
15	1759
16	2212
17	2503
18	3115
19	3478
20	4207
21	4768
22	5506
23	6037
24	7269
25	7947
26	8973
27	9895
28	11272
29	12115
30	13897
31	14860
32	16678
33	18031
34	19777
35	21154
36	23908
37	25279
38	27457
39	29338
40	32362
41	34045
42	37411
43	39262
44	42583

[1, 7, 18, 45, 72, 138, 189, 301, 403, 565, 688, 985, 1156, 1462, 1759, 2212, 2503, 3115, 3478, 4207, 4768, 5506, 6037, 7269, 7947, 8973, 9895, 11272, 12115, 13897, 14860, 16678, 18031, 19777, 21154, 23908, 25279, 27457, 29338, 32362, 34045, 37411, 39262, 42583]

cp's OEIS Frontend

A356042 a(n) = Sum_{k=1..n} sigma_2(k) * floor(n/k).

Table of values

List of values