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A036514 Smallest square containing exactly n 7's. 4
576, 5776, 179776, 12787776, 77774761, 7907477776, 77770707876, 4477777637776, 77777477275716, 3777771174707776, 76978737777779776, 276767777777770756, 3777077879777771776, 477772772701777877776, 39877777877357777777476, 67777770773777677177744 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(20) > 10^28. - Giovanni Resta, Jul 27 2018

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..19

MATHEMATICA

a[n_] := Block[{k=1}, While[DigitCount[k^2, 10, 7] != n, k++]; k]; Array[a, 6] (* Giovanni Resta, Jul 27 2018 *)

CROSSREFS

Cf. A048352. - Jon E. Schoenfield, Jan 24 2009

Sequence in context: A281242 A067225 A268797 * A269034 A188787 A235738

Adjacent sequences:  A036511 A036512 A036513 * A036515 A036516 A036517

KEYWORD

nonn,base

AUTHOR

David W. Wilson

EXTENSIONS

More terms from Jon E. Schoenfield, Jan 24 2009

a(16) from Giovanni Resta, Jul 27 2018

STATUS

approved

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Last modified January 16 23:44 EST 2019. Contains 319206 sequences. (Running on oeis4.)