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A064524 Number of noncubes <= n. 3

%I #16 May 22 2019 02:39:02

%S 0,0,1,2,3,4,5,6,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,

%T 24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,

%U 47,48,49,50,51,52,53,54,55,56,57,58,59,60,60,61,62,63,64,65,66,67,68

%N Number of noncubes <= n.

%H Harry J. Smith, <a href="/A064524/b064524.txt">Table of n, a(n) for n=0..1000</a>

%F a(n) = n - floor(CubicRoot(n)) = n-A048766(n).

%F G.f.: x/(1 - x)^2 - (1/(1 - x))*Sum_{k>=1} x^(k^3). - _Ilya Gutkovskiy_, Feb 16 2017

%o (PARI) { for (n=0, 1000, write("b064524.txt", n, " ", n - floor(n^(1/3) + 0.00000000001)) ) } \\ _Harry J. Smith_, Sep 17 2009

%Y Cf. A048766.

%K nonn

%O 0,4

%A _Reinhard Zumkeller_, Oct 07 2001

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Last modified April 26 07:58 EDT 2024. Contains 371991 sequences. (Running on oeis4.)