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 all elements less than 0 or greater than 10 and replace them with NaN
Project Euler: Problem 10, Sum of Primes
Make a random, non-repeating vector.
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Area of an equilateral triangle
Multivariate polynomials - emulate symbolic form
Multivariate polynomials - sort monomials
Multivariate polynomials - overload multiplication
Fangs of a vampire number
Outer product of multiple vectors
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