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.
Find the numeric mean of the prime numbers in a matrix.
Project Euler: Problem 6, Natural numbers, squares and sums.
2 b | ~ 2 b
Return the Fibonacci Sequence
Multivariate polynomials - sort monomials
Find all vampire fangs
Fangs of a vampire number
Product of two multivariate polynomials
Multivariate polynomials - emulate symbolic form
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