x(x+1)/2=1000000 But I’ve forgotten how to solve square root equations 
Good thing there are online equation solvers! The math checks out! x ~= 1413.7
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Reminds me of the I Am Rich app in the turbulent beginning days of iOS. That guys only needed 1001 buyers to become millionaire… 
Then again I think he did not, because it was banned after 1 day.
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