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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.

A309907 a(n) is the square of the number consisting of one 1 and n 3's: (133...3)^2.

Table of values

n a(n)
0 1
1 169
2 17689
3 1776889
4 177768889
5 17777688889
6 1777776888889
7 177777768888889
8 17777777688888889
9 1777777776888888889
10 177777777768888888889
11 17777777777688888888889
12 1777777777776888888888889
13 177777777777768888888888889
14 17777777777777688888888888889

List of values

[1, 169, 17689, 1776889, 177768889, 17777688889, 1777776888889, 177777768888889, 17777777688888889, 1777777776888888889, 177777777768888888889, 17777777777688888888889, 1777777777776888888888889, 177777777777768888888888889, 17777777777777688888888888889]

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

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