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.

A282600 a(n) = Sum_(k=1..phi(n)) floor(d_k/2) where d_k are the totatives of n.

Table of values

n a(n)
1 0
2 0
3 1
4 1
5 4
6 2
7 9
8 6
9 12
10 8
11 25
12 10
13 36
14 18
15 28
16 28
17 64
18 24
19 81
20 36
21 60
22 50
23 121
24 44
25 120
26 72
27 117
28 78
29 196
30 56
31 225
32 120
33 160
34 128
35 204
36 102
37 324
38 162
39 228
40 152
41 400
42 120
43 441
44 210
45 264
46 242
47 529
48 184
49 504
50 240
51 400
52 300
53 676
54 234
55 540
56 324
57 504
58 392
59 841
60 232

List of values

[0, 0, 1, 1, 4, 2, 9, 6, 12, 8, 25, 10, 36, 18, 28, 28, 64, 24, 81, 36, 60, 50, 121, 44, 120, 72, 117, 78, 196, 56, 225, 120, 160, 128, 204, 102, 324, 162, 228, 152, 400, 120, 441, 210, 264, 242, 529, 184, 504, 240, 400, 300, 676, 234, 540, 324, 504, 392, 841, 232]