1. The problem statement, all variables and given/known data Prove that 2n is representable when n is. Is the converse true? Representable is when a positive integer can be written as the sum of 2 integral squares. 3. The attempt at a solution so n can be written as [itex] x^2+y^2 [/itex] x and y are positive integers so then [itex] 2n=2(x^2+y^2) [/itex] Im not really sure where to go next, maybe i should look a the prime factors. Just to make sure that i know what converse is, Would the converse be if 2n is representable so is n.