Just up to 100,000 you are missing 191 weird numbers. Run my, Rob or Edward's solution to see exactly which ones. Up to 3963968, I don't even want to guess how many are missing. Even Edward's solution would take some time to find out. They aren't quite as rare as you think. Ryan On 12/4/05, Hampton <hcatlin / gmail.com> wrote: > Which ones are missing? > > My set is.... [ > 70,836,4030,5830,7192,7912,9272,10792,17272,45356,73616, # > 83312,91388,113072,243892,254012,338572,343876,388076, # > 519712,539744,555616,682592,786208,1188256,1229152,1713592, # > 1901728,2081824,2189024,3963968 ]