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Old 2011-08-22, 06:08   #4
firejuggler's Avatar
Apr 2010
Over the rainbow

1010000000112 Posts

a driver is something you find from one iteration to another, like 2^2*7, 2*3 and make the sequence grow.
In some case, when the decomposition of the composite is 2* large integer, the sigma of the number is smaller than him., driving the sequence lower and lower, so it is a downdriver.
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