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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.

A332173 a(n) = 7*(10^(2n+1)-1)/9 - 4*10^n.

Table of values

n a(n)
0 3
1 737
2 77377
3 7773777
4 777737777
5 77777377777
6 7777773777777
7 777777737777777
8 77777777377777777
9 7777777773777777777
10 777777777737777777777
11 77777777777377777777777
12 7777777777773777777777777
13 777777777777737777777777777
14 77777777777777377777777777777
15 7777777777777773777777777777777

List of values

[3, 737, 77377, 7773777, 777737777, 77777377777, 7777773777777, 777777737777777, 77777777377777777, 7777777773777777777, 777777777737777777777, 77777777777377777777777, 7777777777773777777777777, 777777777777737777777777777, 77777777777777377777777777777, 7777777777777773777777777777777]

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

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