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.

A077380 Largest n-digit squarefree number whose internal as well as external digits form a squarefree number, or 0 if no such number exists.

Table of values

n a(n)
1 0
2 0
3 977
4 9977
5 99987
6 999987
7 9999987
8 99999977
9 999999985
10 9999999987
11 99999999987
12 999999999987
13 9999999999987
14 99999999999987
15 999999999999987
16 9999999999999987
17 99999999999999987
18 999999999999999987

List of values

[0, 0, 977, 9977, 99987, 999987, 9999987, 99999977, 999999985, 9999999987, 99999999987, 999999999987, 9999999999987, 99999999999987, 999999999999987, 9999999999999987, 99999999999999987, 999999999999999987]

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

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