A331131 - cp's OEIS frontend

A331131 a(n) = Sum_{i=1..n} d(i)*d_3(i+1), where d(n) = A000005(n) and d_3(n) = A007425(n).

n	a(n)
1	3
2	9
3	21
4	30
5	48
6	60
7	80
8	104
9	131
10	143
11	179
12	197
13	215
14	251
15	311
16	326
17	362
18	380
19	416
20	470
21	506
22	518
23	578
24	626
25	653
26	693
27	765
28	783
29	837
30	861
31	903
32	957
33	993
34	1029
35	1173
36	1200
37	1218
38	1254
39	1374
40	1398
41	1452
42	1476
43	1512
44	1620
45	1674
46	1686
47	1776
48	1836
49	1890
50	1944
51	2016
52	2034
53	2094
54	2166
55	2286
56	2358
57	2394

[3, 9, 21, 30, 48, 60, 80, 104, 131, 143, 179, 197, 215, 251, 311, 326, 362, 380, 416, 470, 506, 518, 578, 626, 653, 693, 765, 783, 837, 861, 903, 957, 993, 1029, 1173, 1200, 1218, 1254, 1374, 1398, 1452, 1476, 1512, 1620, 1674, 1686, 1776, 1836, 1890, 1944, 2016, 2034, 2094, 2166, 2286, 2358, 2394]

cp's OEIS Frontend

A331131 a(n) = Sum_{i=1..n} d(i)*d_3(i+1), where d(n) = A000005(n) and d_3(n) = A007425(n).

Table of values

List of values