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A075121
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First integer reached when starting with n/floor(sqrt(n)) and iterating the map x -> x*ceiling(x) A075107(n) times, or -1 if no integer is ever reached.
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2
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1, 2, 3, 2, 60, 3, 14, 4, 3, 1484710602474311520, 220, 4, 227370, 560, 5, 4, 218790, 268065, 570, 5, 1008, 33, 1458660, 6, 5
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