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 A048351 a(n)^2 is the smallest square containing exactly n 6's. 2
 4, 26, 216, 1291, 5164, 68313, 163284, 785294, 3559026, 26393686, 129099069, 254296413, 816435342, 4081257976, 80413106314, 215329205326, 2463064689907, 5165911014784, 24832773982716, 81401883640163 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(21) > 10^14. - Giovanni Resta, Jul 27 2018 LINKS Eric Weisstein's World of Mathematics, Square Number MATHEMATICA a[n_] := Module[{i = 1}, While[DigitCount[i^2][[6]] != n, i++; ]; i]; (* Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 20 2006 *) CROSSREFS Cf. A036513, A034988. Sequence in context: A283828 A306028 A164101 * A224734 A143436 A135884 Adjacent sequences:  A048348 A048349 A048350 * A048352 A048353 A048354 KEYWORD nonn,base AUTHOR Patrick De Geest, Mar 15 1999 EXTENSIONS 816435342 from Sam Handler (sam_5_5_5_0(AT)yahoo.com), Aug 20 2006 a(14), a(15) from Jon E. Schoenfield, Jan 14 2009 a(16) from Jon E. Schoenfield, Jan 24 2009 a(17)-a(20) from Giovanni Resta, Jul 27 2018 STATUS approved

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Last modified January 26 09:38 EST 2021. Contains 340435 sequences. (Running on oeis4.)