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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.

A020338 Doublets: base-10 representation is the juxtaposition of two identical strings.

Table of values

n a(n)
1 11
2 22
3 33
4 44
5 55
6 66
7 77
8 88
9 99
10 1010
11 1111
12 1212
13 1313
14 1414
15 1515
16 1616
17 1717
18 1818
19 1919
20 2020
21 2121
22 2222
23 2323
24 2424
25 2525
26 2626
27 2727
28 2828
29 2929
30 3030
31 3131
32 3232
33 3333
34 3434
35 3535
36 3636
37 3737
38 3838
39 3939
40 4040
41 4141
42 4242
43 4343
44 4444
45 4545
46 4646

List of values

[11, 22, 33, 44, 55, 66, 77, 88, 99, 1010, 1111, 1212, 1313, 1414, 1515, 1616, 1717, 1818, 1919, 2020, 2121, 2222, 2323, 2424, 2525, 2626, 2727, 2828, 2929, 3030, 3131, 3232, 3333, 3434, 3535, 3636, 3737, 3838, 3939, 4040, 4141, 4242, 4343, 4444, 4545, 4646]

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

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