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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.

A020339 a(n)^2 is the least square base-n doublet (base-n representation is the concatenation of 2 identical strings).

Table of values

n a(n)
2 6
3 2
4 615
5 84
6 119973
7 4
8 3
9 23620
10 36363636364
11 6
12 24766945690
13 17928148
14 915
15 4
16 86808207405692007605
17 6
18 130
19 10
20 2667
21 95530227420606
22 10623969116570
23 12
24 5
25 343872950627253606
26 9
27 14
28 59239353339085
29 8130

List of values

[6, 2, 615, 84, 119973, 4, 3, 23620, 36363636364, 6, 24766945690, 17928148, 915, 4, 86808207405692007605, 6, 130, 10, 2667, 95530227420606, 10623969116570, 12, 5, 343872950627253606, 9, 14, 59239353339085, 8130]

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

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