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.

A116288 Numbers k such that k*(k+4) gives the concatenation of a number m with itself.

Table of values

n a(n)
1 7
2 97
3 451
4 546
5 689
6 854
7 997
8 4380
9 5617
10 9997
11 72728
12 99997
13 346531
14 653466
15 999997
16 9090906
17 9999997
18 94117644
19 99999997
20 334665331
21 336032385
22 378253326
23 390977440
24 439928489
25 483516484
26 516483513
27 560071508

List of values

[7, 97, 451, 546, 689, 854, 997, 4380, 5617, 9997, 72728, 99997, 346531, 653466, 999997, 9090906, 9999997, 94117644, 99999997, 334665331, 336032385, 378253326, 390977440, 439928489, 483516484, 516483513, 560071508]