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

A077362

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

Terms

    a(0) =0a(1) =0a(2) =977a(3) =9677a(4) =99377a(5) =998717a(6) =9998777a(7) =99999617a(8) =999999017a(9) =9999996437a(10) =99999997397a(11) =999999997277

External references