A143127 - cp's OEIS frontend

A143127 a(n) = Sum_{k=1..n} k*d(k) where d(k) is the number of divisors of k.

n	a(n)
1	1
2	5
3	11
4	23
5	33
6	57
7	71
8	103
9	130
10	170
11	192
12	264
13	290
14	346
15	406
16	486
17	520
18	628
19	666
20	786
21	870
22	958
23	1004
24	1196
25	1271
26	1375
27	1483
28	1651
29	1709
30	1949
31	2011
32	2203
33	2335
34	2471
35	2611
36	2935
37	3009
38	3161
39	3317
40	3637
41	3719
42	4055
43	4141
44	4405
45	4675
46	4859
47	4953
48	5433

[1, 5, 11, 23, 33, 57, 71, 103, 130, 170, 192, 264, 290, 346, 406, 486, 520, 628, 666, 786, 870, 958, 1004, 1196, 1271, 1375, 1483, 1651, 1709, 1949, 2011, 2203, 2335, 2471, 2611, 2935, 3009, 3161, 3317, 3637, 3719, 4055, 4141, 4405, 4675, 4859, 4953, 5433]

cp's OEIS Frontend

A143127 a(n) = Sum_{k=1..n} k*d(k) where d(k) is the number of divisors of k.

Table of values

List of values