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

A077380

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

Terms

    a(0) =0a(1) =0a(2) =977a(3) =9977a(4) =99987a(5) =999987a(6) =9999987a(7) =99999977a(8) =999999985a(9) =9999999987a(10) =99999999987a(11) =999999999987

External references