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.
Column norms of a matrix
Simple equation: Annual salary
07 - Common functions and indexing 4
Back to basics - mean of corner elements of a matrix
Pi Digit Probability
Product of two multivariate polynomials
Multivariate polynomials - convert monomial form to array
Find all vampire fangs
Multivariate polynomials - overload multiplication
Multivariate polynomials - sort monomials
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