By concatenating these products we get the to pandigital . We will call the "concatenated product of and ". Notice too, that the concatenation of the input numbers, , is also to pandigital.
The same can be done for to pandigital numbers.
What is the largest to pandigital -digit concatenated product of an integer with two or more other integers, such that the concatenation of the input numbers is also a to pandigital -digit number?
Write-up coming later
The complete problem is available here. An approach, code, and answer will be added later.