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Question 305·Hard·Advanced Math

Consider the system of equations

{(x−k)2+y2=4y=2x+1\begin{cases}(x-k)^2 + y^2 = 4\\[4pt]y = 2x + 1\end{cases}

where kk is an integer constant.
If the system has no real solution, what is the least positive integer value of kk?