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 A135660 a(n) = ceiling(sqrt(n) - n^(1/3)). 15

%I

%S 0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,

%T 3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,

%U 5,5,5,5,5,5,5,5,5,5

%N a(n) = ceiling(sqrt(n) - n^(1/3)).

%H Vincenzo Librandi, <a href="/A135660/b135660.txt">Table of n, a(n) for n = 1..999</a>

%t Table[Ceiling[n^(1/2) - n^(1/3)], {n, 100}] (* _Vincenzo Librandi_, Feb 16 2013 *)

%o (MAGMA) [Ceiling(n^(1/2) - n^(1/3)): n in [1..100]]; // _Vincenzo Librandi_, Feb 16 2013

%Y Cf. A000196, A048766, A134914.

%K nonn,easy

%O 1,10

%A _Mohammad K. Azarian_, Nov 25 2007

%E Changed offset from 2 to 1 by _Vincenzo Librandi_, Feb 16 2013

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Last modified September 17 07:35 EDT 2021. Contains 347478 sequences. (Running on oeis4.)