Are you sure about the first rule? It doesn't seem necessary according to https://oeis.org/A014575.
The problem is really fun.
Since I created the problem series and want the Functions I badge, I thought I'd provide the solution that incorporates vampire_factor and are_fangs. Not a great score, but readable!
Sorry, I mean the Magic Numbers badge.
Project Euler: Problem 5, Smallest multiple
Back to basics 21 - Matrix replicating
Matlab Basics - Rounding III
Multivariate polynomials - convert monomial form to array
Fangs of a vampire number
Find all vampire fangs
Multivariate polynomials - sort monomials
Outer product of multiple vectors
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a web site from the following list:
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.
Contact your local office