Spec: P40

P40 (**) Goldbach's conjecture.
Goldbach's conjecture says that every positive even number greater than
2 is the sum of two prime numbers. E.g. 28 = 5 + 23. It is one of the
most famous facts in number theory that has not been proved to be
correct in the general case. It has been numerically confirmed up to
very large numbers (much larger than Scala's Int can represent). Write a
function to find the two prime numbers that sum up to a given even
integer.
scala> 28.goldbach
res0: (Int, Int) = (5,23)
Fix Spec: P40

Do not try to compute Goldbach pair for an odd number just after testing
odd numbers throw an exception... :$
Done: P40

P40 (**) Goldbach's conjecture.
Goldbach's conjecture says that every positive even number greater than
2 is the sum of two prime numbers. E.g. 28 = 5 + 23. It is one of the
most famous facts in number theory that has not been proved to be
correct in the general case. It has been numerically confirmed up to
very large numbers (much larger than Scala's Int can represent). Write a
function to find the two prime numbers that sum up to a given even
integer.
scala> 28.goldbach
res0: (Int, Int) = (5,23)