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 8, Find largest product in a large string of numbers
Back to basics 22 - Rotate a matrix
Rotate a Matrix
Convert a vector into a number
Number of Even Elements in Fibonacci Sequence
Product of two multivariate polynomials
Multivariate polynomials - overload multiplication
Multivariate polynomials - convert monomial form to array
Fangs of a vampire number
Find all vampire fangs
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