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.

A372227 a(n) = Sum_{k=1..n} sigma( (n/gcd(k,n))^2 ).

Table of values

n a(n)
1 1
2 8
3 27
4 70
5 125
6 216
7 343
8 578
9 753
10 1000
11 1331
12 1890
13 2197
14 2744
15 3375
16 4666
17 4913
18 6024
19 6859
20 8750
21 9261
22 10648
23 12167
24 15606
25 15745
26 17576
27 20427
28 24010
29 24389
30 27000
31 29791
32 37418
33 35937
34 39304
35 42875
36 52710
37 50653
38 54872
39 59319
40 72250
41 68921
42 74088

List of values

[1, 8, 27, 70, 125, 216, 343, 578, 753, 1000, 1331, 1890, 2197, 2744, 3375, 4666, 4913, 6024, 6859, 8750, 9261, 10648, 12167, 15606, 15745, 17576, 20427, 24010, 24389, 27000, 29791, 37418, 35937, 39304, 42875, 52710, 50653, 54872, 59319, 72250, 68921, 74088]