Write a function that has the following property: f(f(x)) = -x for any numeric array x.
Note that there is no restriction on the output for f(x). How bizarre can you make it?
This one really surprised me.
Getting a little silly!
Remove the vowels
Sums with Excluded Digits
Find the sum of the elements in the "second" diagonal
Back to basics 4 - Search Path
Create a two dimensional zero matrix
Multivariate polynomials - emulate symbolic form
Fangs of a vampire number
Multivariate polynomials - convert monomial form to array
Find vampire numbers
Product of two multivariate polynomials
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