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
594 Solvers
Project Euler: Problem 6, Natural numbers, squares and sums.
1018 Solvers
The sum of the numbers in the vector
426 Solvers
Rounding off numbers to n decimals
1050 Solvers
555 Solvers
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