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Search: id:A061433
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| A061433 |
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Largest n-digit square. |
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+0
7
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| 9, 81, 961, 9801, 99856, 998001, 9998244, 99980001, 999950884, 9999800001, 99999515529, 999998000001, 9999995824729, 99999980000001, 999999961946176, 9999999800000001, 99999999989350756, 999999998000000001
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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When (if ever) does this differ from A069659?
Trivially, 81 is both a square and a fourth power. Assuming my program works, there are no differences in the first 1500 terms. - Hans Havermann, Aug 06 2006
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FORMULA
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a(n)=(ceil(10^(n/2))-1)^2 - Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Mar 30 2003
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EXAMPLE
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a(4) = 9801 = 99^2 has 4 digits while 100^2 = 10000 has 5 digits.
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MAPLE
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A061433 := n->(ceil(10^(n/2))-1)^2;
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CROSSREFS
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Cf. A061432.
Sequence in context: A113361 A068881 A104266 this_sequence A069659 A110853 A003302
Adjacent sequences: A061430 A061431 A061432 this_sequence A061434 A061435 A061436
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KEYWORD
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nonn,base,easy
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 03 2001
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EXTENSIONS
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More terms from Larry Reeves (larryr(AT)acm.org), May 16 2001
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