Numbers k such that the largest k-digit odd number concatenated with the smallest k-digit odd number is prime.
A247183
Numbers k such that the largest k-digit odd number concatenated with the smallest k-digit odd number is prime.
Terms
- a(0) =3a(1) =7a(2) =17a(3) =51a(4) =343a(5) =423a(6) =6453
External references
- oeis: A247183