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English: The first perfect squared square discovered, a compound one of side 4205 and order 55, found by RPS Sprague in 1939.[1] Each number denotes the side length of its square.
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Author Cmglee


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  1. o55-4205-sprague.pdf. Retrieved on 25 August 2015.

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current18:20, 25 August 2015Thumbnail for version as of 18:20, 25 August 2015512 × 512 (7 KB)Cmglee{{Information |Description ={{en|1=The first squared square, a compound one of side 4205 and order 55, discovered by RPS Sprague in 1939. }} |Source ={{own}} |Author =Cmglee |Date = |Permission = |other_...
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