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.

A180116 A008619(n-1)-fold concatenation of A109613(n).

Table of values

n a(n)
1 1
2 3
3 33
4 55
5 555
6 777
7 7777
8 9999
9 99999
10 1111111111
11 111111111111
12 131313131313
13 13131313131313
14 15151515151515
15 1515151515151515
16 1717171717171717
17 171717171717171717
18 191919191919191919
19 19191919191919191919
20 21212121212121212121
21 2121212121212121212121

List of values

[1, 3, 33, 55, 555, 777, 7777, 9999, 99999, 1111111111, 111111111111, 131313131313, 13131313131313, 15151515151515, 1515151515151515, 1717171717171717, 171717171717171717, 191919191919191919, 19191919191919191919, 21212121212121212121, 2121212121212121212121]

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

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