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.
Create a square matrix of multiples
Implement simple rotation cypher
Relative ratio of "1" in binary number
String Array Basics, Part 1: Convert Cell Array to String Array; No Missing Values
Find all vampire fangs
Multivariate polynomials - overload multiplication
Negation the hard way
Multivariate polynomials - convert monomial form to array
Outer product of multiple vectors
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