[math-fun] Number Theory 101

The smallest decimal-digits prime composed of the concatenation of 7 distinct decimal-digit primes is 1113257317, composed of 11, 13, 2, 5, 7, 3, and 17. What are the first three digits of the smallest decimal- digits prime composed of the concatenation of 26 distinct decimal- digit primes? (Bonus marks: Allowing probable primes, what is the entire number?)