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.
Least common multiple of many numbers
Back to basics 12 - Input Arguments
Set the array elements whose value is 13 to 0
Given a square and a circle, please decide whether the square covers more area.
Find all vampire fangs
Fangs of a vampire number
Multivariate polynomials - sort monomials
Outer product of multiple vectors
Negation the hard way
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