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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.

A332172 a(n) = 7*(10^(2n+1)-1)/9 - 5*10^n.

Table of values

n a(n)
0 2
1 727
2 77277
3 7772777
4 777727777
5 77777277777
6 7777772777777
7 777777727777777
8 77777777277777777
9 7777777772777777777
10 777777777727777777777
11 77777777777277777777777
12 7777777777772777777777777
13 777777777777727777777777777
14 77777777777777277777777777777
15 7777777777777772777777777777777

List of values

[2, 727, 77277, 7772777, 777727777, 77777277777, 7777772777777, 777777727777777, 77777777277777777, 7777777772777777777, 777777777727777777777, 77777777777277777777777, 7777777777772777777777777, 777777777777727777777777777, 77777777777777277777777777777, 7777777777777772777777777777777]

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

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