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.
Program an exclusive OR operation with logical operators
Back to basics 12 - Input Arguments
Find nearest prime number less than input number
ベクトル [1 2 3 4 5 6 7 8 9 10] の作成
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Outer product of multiple vectors
Find all vampire fangs
Negation the hard way
Multivariate polynomials - overload multiplication
Multivariate polynomials - emulate symbolic form
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