convert :: Integer -> String
convert n =
    if result == ""
       then show n
    else
        result
    where result = factorThree n ++ factorFive n ++ factorSeven n
convert :: Integer -> String
convert n =
    if result == ""
       then show n
    else
        result
    where result = factorThree n ++ factorFive n ++ factorSeven n
convert n =
    if result == ""
       then show n
    else
        result
    where result = factorThree n ++ factorFive n ++ factorSeven n