1289
This number is a prime.
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On an infinite spiral-numbered chessboard, if a queen starts from 1 (centre of the spiral) and repeatedly moves
to the nearest unvisited prime-numbered square, then eventually the queen can no longer move after, at square number
1289. [Gudipati]
Submitted: 2026-07-01 11:09:39; Last Modified: 2026-07-01 12:11:02.
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