cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A143128 a(n) = Sum_{k=1..n} k*sigma(k).

Table of values

n a(n)
1 1
2 7
3 19
4 47
5 77
6 149
7 205
8 325
9 442
10 622
11 754
12 1090
13 1272
14 1608
15 1968
16 2464
17 2770
18 3472
19 3852
20 4692
21 5364
22 6156
23 6708
24 8148
25 8923
26 10015
27 11095
28 12663
29 13533
30 15693
31 16685
32 18701
33 20285
34 22121
35 23801
36 27077
37 28483
38 30763
39 32947
40 36547

List of values

[1, 7, 19, 47, 77, 149, 205, 325, 442, 622, 754, 1090, 1272, 1608, 1968, 2464, 2770, 3472, 3852, 4692, 5364, 6156, 6708, 8148, 8923, 10015, 11095, 12663, 13533, 15693, 16685, 18701, 20285, 22121, 23801, 27077, 28483, 30763, 32947, 36547]