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 A061439 Largest number whose cube has n digits. 14
 2, 4, 9, 21, 46, 99, 215, 464, 999, 2154, 4641, 9999, 21544, 46415, 99999, 215443, 464158, 999999, 2154434, 4641588, 9999999, 21544346, 46415888, 99999999, 215443469, 464158883, 999999999, 2154434690, 4641588833, 9999999999 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(n) + A181375(n) + A181377(n) + A181379(n) + A181381(n) + A181400(n) + A181402(n) + A181404(n) + A130130(n) = A002283(n). LINKS FORMULA a(n) = ceiling(10^(n/3)) - 1. - Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Mar 30 2003 EXAMPLE a(5) = 46 because 46^3 = 97336 has 5 digits, while 47^3 = 103823 has 6 digits. MAPLE Digits := 100: A061439 := n->ceil(10^(n/3))-1: seq (A061439(n), n=1..40); MATHEMATICA t={}; i=0; Do[i=i+1; While[IntegerLength[i^3]<=n, i++]; AppendTo[t, i-1], {n, 20}]; t (* Jayanta Basu, May 19 2013 *) CROSSREFS a(n) is one more than the corresponding term of A018005. Cf. A061435. Sequence in context: A332800 A093698 A091619 * A027711 A307548 A084634 Adjacent sequences:  A061436 A061437 A061438 * A061440 A061441 A061442 KEYWORD nonn,base,easy AUTHOR Amarnath Murthy, May 03 2001 EXTENSIONS More terms from Larry Reeves (larryr(AT)acm.org), May 16 2001 Typo in Maple program fixed by Martin Renner, Jan 31 2011 STATUS approved

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Last modified July 31 02:33 EDT 2021. Contains 346367 sequences. (Running on oeis4.)