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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.

A189481 Numbers n such that x' = n has a unique solution, where x' denotes the arithmetic derivative (A003415).

Table of values

n a(n)
1 4
2 5
3 6
4 7
5 8
6 9
7 13
8 15
9 19
10 25
11 27
12 33
13 41
14 43
15 49
16 51
17 59
18 63
19 69
20 73
21 77
22 85
23 95
24 99
25 105
26 109
27 113
28 115
29 121
30 133
31 135
32 139
33 141
34 143
35 153
36 155
37 159
38 161
39 169
40 171
41 175
42 181
43 187
44 193
45 201
46 203
47 225
48 227
49 229
50 235
51 239
52 249
53 251
54 253
55 259
56 265
57 267
58 273

List of values

[4, 5, 6, 7, 8, 9, 13, 15, 19, 25, 27, 33, 41, 43, 49, 51, 59, 63, 69, 73, 77, 85, 95, 99, 105, 109, 113, 115, 121, 133, 135, 139, 141, 143, 153, 155, 159, 161, 169, 171, 175, 181, 187, 193, 201, 203, 225, 227, 229, 235, 239, 249, 251, 253, 259, 265, 267, 273]

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

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