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A048348 a(n)^2 is the smallest square containing exactly n 3's. 2
6, 56, 586, 1156, 11547, 57735, 559769, 1197219, 6582806, 36514844, 350903624, 1798230611, 1825769244, 48304278624, 11547014044, 577333277556, 1527394295306, 6582576498844, 57465931849517 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(20) > 10^14. - Giovanni Resta, Jul 27 2018

LINKS

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

Eric Weisstein's World of Mathematics, Square Number

MATHEMATICA

a[n_] := Block[{k=1}, While[DigitCount[k^2, 10, 3] != n, k++]; k]; Array[a, 6] (* Giovanni Resta, Jul 27 2018 *)

CROSSREFS

Cf. A036510, A034982.

Sequence in context: A093142 A092655 A099140 * A227384 A199755 A025749

Adjacent sequences:  A048345 A048346 A048347 * A048349 A048350 A048351

KEYWORD

nonn,base,more

AUTHOR

Patrick De Geest, Mar 15 1999

EXTENSIONS

More terms from Jon E. Schoenfield, Jan 11 2009

a(18)-a(19) from Giovanni Resta, Jul 27 2018

STATUS

approved

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Last modified November 23 21:51 EST 2020. Contains 338603 sequences. (Running on oeis4.)