lancs blue
Well-Known Member
Sorry to be picky but if you put 1 grain on the first square then the final square will have 2 to the power 63 grains which will be exactly half of that number. ;-)Put one grain on the first square, double it to 2, then 4 etc. And guess how many would be on the 64th and final square. Almost everyone vastly under estimates how such growth accelerates as it looks 'small numbers' at first.
But the answer is 18,446,744,073,709,551,615.