Originally Posted by PaulRS Let: if 5 doesn't divide n, and if 5 does divide n
The coefficient of stays untouched if we change for
But: is the number of multiples of 5 between 0 and n, thus we have where is the floor function
So the coefficient of turns out to be whered you get the +1?
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Originally Posted by p00ndawg whered you get the +1? 0 is multiple of 5
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