OK I have an infinite table. As you can see the numbers are all arranged by a sequence. Determine the number in the 1000th row and 900th column. Can you also come up with a formula for Rth row and Cth column?
4 ---7--10--13 ...
7---12--17--22 ...
10-17--24--31 ...
13-22--31--40 ...
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