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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.

A189561 Number of even numbers k that have n solutions to the equation x' = k, where x' denotes the arithmetic derivative (A003415).

Table of values

n a(n)
0 1
1 3
2 7
3 9
4 13
5 13
6 16
7 18
8 19
9 24
10 17
11 26
12 17
13 23
14 25
15 23
16 28
17 25
18 23
19 37
20 21
21 28
22 25
23 22
24 36
25 30
26 34
27 38
28 28
29 28
30 27
31 28
32 45
33 37
34 35
35 36
36 34
37 35
38 33
39 33
40 31
41 35
42 35
43 31
44 43
45 33
46 37
47 44
48 36
49 37
50 38
51 30
52 50
53 36
54 44
55 47
56 43
57 33
58 43
59 50
60 36
61 39
62 38
63 31
64 41
65 48

List of values

[1, 3, 7, 9, 13, 13, 16, 18, 19, 24, 17, 26, 17, 23, 25, 23, 28, 25, 23, 37, 21, 28, 25, 22, 36, 30, 34, 38, 28, 28, 27, 28, 45, 37, 35, 36, 34, 35, 33, 33, 31, 35, 35, 31, 43, 33, 37, 44, 36, 37, 38, 30, 50, 36, 44, 47, 43, 33, 43, 50, 36, 39, 38, 31, 41, 48]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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