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A036511 Smallest square containing exactly n 4's. 3
4, 144, 1444, 44944, 6441444, 47444544, 4434494464, 44424414441, 4243443441444, 44844344414464, 444431244445444, 44044624434444544, 441544444344443449, 14444545446449449444, 346454444084444444644, 44024844440444424044544, 444448493447444044441744 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(21) > 10^28. - Giovanni Resta, Jul 27 2018

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..20

MATHEMATICA

a[n_] := Block[{k=1}, While[DigitCount[k^2, 10, 4] != n, k++]; k^2]; Array[a, 7] (* Giovanni Resta, Jul 27 2018 *)

CROSSREFS

Cf. A048349. - Jon E. Schoenfield, Jan 24 2009

Sequence in context: A017294 A273698 A134631 * A263386 A186720 A060870

Adjacent sequences:  A036508 A036509 A036510 * A036512 A036513 A036514

KEYWORD

nonn,base

AUTHOR

David W. Wilson

EXTENSIONS

a(13)-a(16) from Jon E. Schoenfield, Jan 17 2009

a(17) from Giovanni Resta, Jul 27 2018

STATUS

approved

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Last modified October 17 19:18 EDT 2018. Contains 316293 sequences. (Running on oeis4.)