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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 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.)