I actually already tried +3 and -3 and then +5 and -5 to each number and just to the first number. I also took 31 16 89 and 15 16 89 and tried them in all possible positions. I really don't want to call someone in, as that takes all the fun out of it. If I get totally sick of this that will be my Plan B. Also I just finished trying all the numbers everyone has posted so far.