content: sumaImpares :: Integer -> Integer 
  sumaImpares n = auxImpares n 0 
  
  auxImpares :: Integer -> Integer -> Integer
  auxImpares 0 _ = 0 
  auxImpares n c = (2*c + 1) + (auxImpares (n-1) (c+1)) 
  
  
  
  -- 1,3,5,7,9,11,13,...