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Ant
I like what you were trying to do, but it's too hard with some of the numbers you've chosen. For example I guessed that square numbers could be a potential group but didn't have time to find all the square numbers against the clock (at least without a calculator to hand). How anyone is supposed to figure out 33550336 is perfect is beyond me.
(3 years, 4 months ago)

 

 


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