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A017936
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Smallest number whose square has n digits.
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16
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1, 4, 10, 32, 100, 317, 1000, 3163, 10000, 31623, 100000, 316228, 1000000, 3162278, 10000000, 31622777, 100000000, 316227767, 1000000000, 3162277661, 10000000000, 31622776602, 100000000000, 316227766017, 1000000000000
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n) = ceiling(10^((n-1)/2)).
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EXAMPLE
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a(4) = 32, 32^2 = 1024 has 4 digits, while 31^2 = 961 has 3 digits.
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MAPLE
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MATHEMATICA
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Table[Ceiling[Sqrt[10^n]], {n, 0, 30}] (* Harvey P. Dale, Jan 19 2012 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,base,easy
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AUTHOR
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EXTENSIONS
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More terms from Larry Reeves (larryr(AT)acm.org), May 16 2001
More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Mar 30 2003
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STATUS
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approved
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