Divisibility is just an excuse.

Calculus Level 3

If 1+r=018(r(r+2)+1)r!=k!1+ \displaystyle \sum_{r=0}^{18} \big(r(r+2)+1 \big)r! =k! then kk is not divisible by


You can try my other Sequences And Series problems by clicking here : Part II and here : Part I.
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