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.

A372996 a(n) = Sum_{k=1..n} sigma_2( (n/gcd(k,n))^2 ).

Table of values

n a(n)
1 1
2 22
3 183
4 704
5 2605
6 4026
7 14707
8 22548
9 44469
10 57310
11 147631
12 128832
13 344773
14 323554
15 476715
16 721596
17 1340977
18 978318
19 2352295
20 1833920
21 2691381
22 3247882
23 6168163
24 4126284
25 8140625
26 7585006
27 10806147
28 10353728
29 19827445
30 10487730
31 27734491
32 23091212
33 27016473

List of values

[1, 22, 183, 704, 2605, 4026, 14707, 22548, 44469, 57310, 147631, 128832, 344773, 323554, 476715, 721596, 1340977, 978318, 2352295, 1833920, 2691381, 3247882, 6168163, 4126284, 8140625, 7585006, 10806147, 10353728, 19827445, 10487730, 27734491, 23091212, 27016473]