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Search: id:A017936
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| A017936 |
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Smallest number whose square has n digits. |
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+0
11
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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
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n)=ceil(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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A061436 := n->ceil(10^((n-1)/2));
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CROSSREFS
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Cf. A061432.
Sequence in context: A015796 A034717 A001673 this_sequence A033297 A129880 A137954
Adjacent sequences: A017933 A017934 A017935 this_sequence A017937 A017938 A017939
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KEYWORD
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nonn,base,easy
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AUTHOR
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njas
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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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