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.
given 3 sides, find area of this triangle
All your base are belong to us
Column norms of a matrix
Circular Primes (based on Project Euler, problem 35)
MATLAB Basic: rounding
Outer product of multiple vectors
Product of two multivariate polynomials
Multivariate polynomials - convert monomial form to array
Multivariate polynomials - sort monomials
Fangs of a vampire number
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