2001 Fermat Problem 21

A spiral of numbers is created, as shown, starting with 1. If the pattern of the spiral continues, in what configuration will the numbers 399, 400 and 401 appear?

\begin{array}{ccccccccc} &&10&\to&11&\to&12&\to&13\\ &&\uparrow&&&&&&\downarrow\\ &&9&&2&\to&3&&14\\ &&\uparrow&&\uparrow&&\downarrow&&\downarrow\\ \vdots&&8&&1&&4&&15\\ \uparrow&&\uparrow&&&&\downarrow&&\downarrow\\ 22&&7&\leftarrow&6&\leftarrow&5&&16\\ \uparrow&&&&&&&&\downarrow\\ 21&\leftarrow&20&\leftarrow&19&\leftarrow&18&\leftarrow&17 \end{array}

\textbf{(A)}\ 399\to400\to401\quad \textbf{(B)}\ 401\leftarrow400\leftarrow399\quad \textbf{(C)}\ \begin{array}{c}401\\\uparrow\\400\\\uparrow\\399\end{array}\quad \textbf{(D)}\ \begin{array}{c}399\\\downarrow\\400\\\downarrow\\401\end{array}\quad \textbf{(E)}\ \begin{array}{ccc}400&\to&401\\\uparrow&&\\399&&\end{array}

If there are no answer choices shown, enter a numerical answer.

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