prod even numbers
Fix bug: first element of list wasn't being multiplied
Scalar prod between 2 lists
num of elems that satisfy a condition
Apply list of ops to list
pam2
filterfold
Implementinf 'map' with lists comprehension
Implementing filter with lists comprehensionx
Get pairs of numbers that can be divided by X, using lists comprehension
factors of number, using lists comprehension
pythagorean possible tuples, using lists comprehension