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A048346
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a(n)^2 is the smallest square containing exactly n 1's in its decimal notation.
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1
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0, 1, 11, 109, 1054, 3381, 10541, 105414, 414139, 1055041, 10252371, 78173596, 334082481, 1187901979, 1055036071, 33333407869, 105409293239, 718412219489, 1054501356619, 10536182856619
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OFFSET
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0,3
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COMMENTS
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a(20) > 10^14. - Giovanni Resta, Jul 27 2018
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LINKS
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Table of n, a(n) for n=0..19.
Eric Weisstein's World of Mathematics, Square Number
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MATHEMATICA
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a[n_] := Block[{k=0}, While[DigitCount[k^2, 10, 1] != n, k++]; k]; Array[a, 8, 0] (* Giovanni Resta, Jul 27 2018 *)
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CROSSREFS
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Cf. A036508, A034978.
Sequence in context: A159495 A125423 A165149 * A054320 A287836 A124290
Adjacent sequences: A048343 A048344 A048345 * A048347 A048348 A048349
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KEYWORD
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nonn,base,more
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AUTHOR
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Patrick De Geest, Mar 15 1999
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EXTENSIONS
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More terms from Jon E. Schoenfield, Jan 11 2009
Initial zero added by Zak Seidov, Nov 22 2010
a(17)-a(19) from Giovanni Resta, Jul 27 2018
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STATUS
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approved
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