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A126981
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Largest perfect square less than 2*10^n.
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0
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1, 16, 196, 1936, 19881, 199809, 1999396, 19998784, 199996164, 1999967841, 19999899241, 199999467369, 1999998409369, 19999991458225, 199999982358225, 1999999950806881, 19999999932878736, 199999999552824025
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listen;
history;
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internal format)
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = floor(sqrt(2*10^n))^2.
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EXAMPLE
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a(4) = 19881 because 19881 is the largest perfect square less than 2*10^4.
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MATHEMATICA
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Table[Floor[Sqrt[2*10^k]]^2, {k, 0, 30}]
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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Adam M. Kalman (akalman(AT)icsd.k12.ny.us), Mar 21 2007
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STATUS
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approved
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