A320896 - cp's OEIS frontend

A320896 a(n) = Sum_{k=1..n} k * tau(k)^2, where tau is A000005.

n	a(n)
1	1
2	9
3	21
4	57
5	77
6	173
7	201
8	329
9	410
10	570
11	614
12	1046
13	1098
14	1322
15	1562
16	1962
17	2030
18	2678
19	2754
20	3474
21	3810
22	4162
23	4254
24	5790
25	6015
26	6431
27	6863
28	7871
29	7987
30	9907
31	10031
32	11183
33	11711
34	12255
35	12815
36	15731
37	15879
38	16487
39	17111
40	19671
41	19835
42	22523
43	22695
44	24279

[1, 9, 21, 57, 77, 173, 201, 329, 410, 570, 614, 1046, 1098, 1322, 1562, 1962, 2030, 2678, 2754, 3474, 3810, 4162, 4254, 5790, 6015, 6431, 6863, 7871, 7987, 9907, 10031, 11183, 11711, 12255, 12815, 15731, 15879, 16487, 17111, 19671, 19835, 22523, 22695, 24279]

cp's OEIS Frontend

A320896 a(n) = Sum_{k=1..n} k * tau(k)^2, where tau is A000005.

Table of values

List of values