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.

A328845 The first Fibonacci based variant of arithmetic derivative: a(p) = A000045(p) for prime p, a(u*v) = a(u)*v + u*a(v), with a(0) = a(1) = 0.

Table of values

n a(n)
0 0
1 0
2 1
3 2
4 4
5 5
6 7
7 13
8 12
9 12
10 15
11 89
12 20
13 233
14 33
15 25
16 32
17 1597
18 33
19 4181
20 40
21 53
22 189
23 28657
24 52
25 50
26 479
27 54
28 80
29 514229
30 65
31 1346269
32 80
33 289
34 3211
35 100
36 84
37 24157817
38 8381
39 725
40 100
41 165580141
42 127
43 433494437
44 400
45 105
46 57337
47 2971215073
48 128
49 182
50 125
51 4825
52 984
53 53316291173
54 135
55 500
56 188
57 12581
58 1028487
59 956722026041
60 160

List of values

[0, 0, 1, 2, 4, 5, 7, 13, 12, 12, 15, 89, 20, 233, 33, 25, 32, 1597, 33, 4181, 40, 53, 189, 28657, 52, 50, 479, 54, 80, 514229, 65, 1346269, 80, 289, 3211, 100, 84, 24157817, 8381, 725, 100, 165580141, 127, 433494437, 400, 105, 57337, 2971215073, 128, 182, 125, 4825, 984, 53316291173, 135, 500, 188, 12581, 1028487, 956722026041, 160]