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A048348
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a(n)^2 is the smallest square containing exactly n 3's.
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1
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6, 56, 586, 1156, 11547, 57735, 559769, 1197219, 6582806, 36514844, 350903624, 1798230611, 1825769244, 48304278624, 11547014044, 577333277556, 1527394295306
(list; graph; refs; listen; history; internal format)
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