Are you sure about the first rule? It doesn't seem necessary according to https://oeis.org/A014575.
The problem is really fun.
cheating
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.
Like it
12519 Solvers
242 Solvers
Make a random, non-repeating vector.
3042 Solvers
Replace multiples of 5 with NaN
362 Solvers
104 Solvers
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