 
   log ''
   show -> number(98).gcd 21
+  show -> number(77777).gcd 21
 
   log ''
   show -> a = number Math.pow 2, 13

  show -> number(9801).sqrt()
  show -> number(998001).sqrt()
  show -> number(99980001).sqrt()

  div__: (x) -> new CheckedInt Math.floor @val / x.val

  mod__: (x) -> new CheckedInt @val % x.val

  toString: -> "" + @val

