Numbers k such that the smallest k-digit odd number concatenated with the largest k-digit odd number is prime.
A247182
Numbers k such that the smallest k-digit odd number concatenated with the largest k-digit odd number is prime.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =21a(4) =5571a(5) =6493a(6) =14481
External references
- oeis: A247182