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A048349
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a(n)^2 is the smallest square containing exactly n 4's.
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1
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2, 12, 38, 212, 2538, 6888, 66592, 210771, 2059962, 6696592, 21081538, 209868112, 664488107, 3800598038, 18613286762, 209820981888, 666669703412, 666516649788, 6666894662768, 49400874945738
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OFFSET
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1,1
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COMMENTS
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a(21) > 10^14. - Giovanni Resta, Jul 27 2018
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LINKS
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Table of n, a(n) for n=1..20.
Eric Weisstein's World of Mathematics, Square Number
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MATHEMATICA
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a[n_] := Block[{k=1}, While[DigitCount[k^2, 10, 4] != n, k++]; k]; Array[a, 7] (* Giovanni Resta, Jul 27 2018 *)
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CROSSREFS
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Cf. A036511, A034984.
Sequence in context: A035597 A000913 A026575 * A009632 A190022 A086602
Adjacent sequences: A048346 A048347 A048348 * A048350 A048351 A048352
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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 14 2009
a(17)-a(20) from Giovanni Resta, Jul 27 2018
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STATUS
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approved
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