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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.

A218011 Numbers n for which n’ = x’*y’, where x>0, y>0, n = x + y and n’, x’, y’ are the arithmetic derivatives of n, x, y.

Table of values

n a(n)
1 5
2 7
3 13
4 19
5 31
6 43
7 48
8 55
9 61
10 73
11 74
12 87
13 103
14 106
15 109
16 117
17 139
18 146
19 151
20 159
21 160
22 178
23 181
24 193
25 199
26 202
27 208
28 212
29 225
30 229
31 236
32 241
33 252
34 267
35 268
36 271
37 283
38 285
39 298
40 313
41 349
42 357
43 362
44 386
45 403
46 411
47 421
48 433
49 455
50 463
51 496
52 511
53 519
54 523
55 535

List of values

[5, 7, 13, 19, 31, 43, 48, 55, 61, 73, 74, 87, 103, 106, 109, 117, 139, 146, 151, 159, 160, 178, 181, 193, 199, 202, 208, 212, 225, 229, 236, 241, 252, 267, 268, 271, 283, 285, 298, 313, 349, 357, 362, 386, 403, 411, 421, 433, 455, 463, 496, 511, 519, 523, 535]

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

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