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.

A368641 a(n) = Sum_{k=2..n} pi(k-1) * (ceiling(n/k) - floor(n/k)).

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 3
6 4
7 8
8 9
9 14
10 17
11 23
12 21
13 32
14 34
15 40
16 43
17 55
18 53
19 68
20 67
21 79
22 87
23 99
24 92
25 114
26 120
27 129
28 132
29 152
30 145
31 171
32 169
33 187
34 197
35 209
36 203
37 236
38 240
39 253
40 251
41 283
42 274
43 308
44 307
45 322
46 341
47 363
48 347
49 389
50 392
51 415
52 421
53 452
54 443
55 477
56 475
57 507
58 522
59 547
60 522

List of values

[0, 0, 0, 1, 3, 4, 8, 9, 14, 17, 23, 21, 32, 34, 40, 43, 55, 53, 68, 67, 79, 87, 99, 92, 114, 120, 129, 132, 152, 145, 171, 169, 187, 197, 209, 203, 236, 240, 253, 251, 283, 274, 308, 307, 322, 341, 363, 347, 389, 392, 415, 421, 452, 443, 477, 475, 507, 522, 547, 522]