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.
The Tower of Hanoi
Project Euler: Problem 8, Find largest product in a large string of numbers
Arrange Vector in descending order
Better bullseye matrix
Multivariate polynomials - sort monomials
Fangs of a vampire number
Find all vampire fangs
Product of two multivariate polynomials
Negation the hard way
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