A077115 - OEIS

A077115

Least integer square >= n^3.

0, 1, 9, 36, 64, 144, 225, 361, 529, 729, 1024, 1369, 1764, 2209, 2809, 3481, 4096, 5041, 5929, 6889, 8100, 9409, 10816, 12321, 13924, 15625, 17689, 19881, 22201, 24649, 27225, 29929, 33124, 36100, 39601, 43264, 46656, 51076, 55225, 59536

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OFFSET

0,3

COMMENTS

a(n) - A070929(n) = n^3.

LINKS

Table of n, a(n) for n=0..39.

FORMULA

a(n) = ceiling(n^(3/2))^2. - Benoit Cloitre, Nov 01 2002

EXAMPLE

a(10)=1024, as 1024=32^2 is the least square >= 1000 = 10^3.

MATHEMATICA

lis[n_]:=Module[{c=Sqrt[n^3]}, If[IntegerQ[c], c^2, (Floor[c]+1)^2]]; Array[lis, 40, 0] (* Harvey P. Dale, Jan 22 2013 *)

PROG

(Magma) [Ceiling(n^(3/2))^2: n in [0..50]]; // Vincenzo Librandi, Feb 17 2015

CROSSREFS

Cf. A000290, A000578, A065733, A077107, A077118.

Sequence in context: A258844 A294952 A068810 * A297584 A073946 A016766

Adjacent sequences: A077112 A077113 A077114 * A077116 A077117 A077118

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Oct 29 2002

STATUS

approved