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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.

A239562 Numbers n such that n = concatenate(a, b) and sigma(a) + sigma(b) = sigma(n) - n.

Table of values

n a(n)
1 39
2 119
3 253
4 581
5 1875
6 2077
7 14477
8 15879
9 17823
10 100637
11 160529
12 232477
13 251189
14 286437
15 506587
16 552739
17 605729
18 806179
19 1170695
20 3272257
21 3295289
22 4085129
23 4201441
24 4657133
25 4844701
26 5625173
27 8106509
28 12430289
29 23943721
30 33857009
31 41782973
32 64012513

List of values

[39, 119, 253, 581, 1875, 2077, 14477, 15879, 17823, 100637, 160529, 232477, 251189, 286437, 506587, 552739, 605729, 806179, 1170695, 3272257, 3295289, 4085129, 4201441, 4657133, 4844701, 5625173, 8106509, 12430289, 23943721, 33857009, 41782973, 64012513]

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

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