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.

A340180 a(n) = Sum_{x in C(n)} (sigma(n) mod x), where C(n) is the set of numbers < n coprime to n, and sigma = A000203.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 2
6 2
7 7
8 1
9 16
10 4
11 16
12 9
13 30
14 23
15 26
16 24
17 46
18 19
19 60
20 30
21 60
22 52
23 84
24 43
25 132
26 77
27 105
28 62
29 137
30 51
31 166
32 88
33 183
34 139
35 182
36 117
37 247
38 186
39 239
40 158
41 283
42 99
43 327
44 194
45 259
46 284
47 373
48 176
49 462
50 234
51 442
52 294
53 491
54 235
55 508
56 294
57 514
58 430
59 585
60 259
61 671
62 519
63 546
64 408
65 749
66 323
67 798

List of values

[0, 0, 0, 1, 2, 2, 7, 1, 16, 4, 16, 9, 30, 23, 26, 24, 46, 19, 60, 30, 60, 52, 84, 43, 132, 77, 105, 62, 137, 51, 166, 88, 183, 139, 182, 117, 247, 186, 239, 158, 283, 99, 327, 194, 259, 284, 373, 176, 462, 234, 442, 294, 491, 235, 508, 294, 514, 430, 585, 259, 671, 519, 546, 408, 749, 323, 798]