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a(n) = floor(sqrt(n) - n^(1/4)).
12

%I #22 Sep 08 2022 08:45:32

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

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

%U 5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7

%N a(n) = floor(sqrt(n) - n^(1/4)).

%H Vincenzo Librandi, <a href="/A135663/b135663.txt">Table of n, a(n) for n = 1..1000</a>

%t Table[Floor[n^(1/2) - n^(1/4)], {n, 100}] (* _Vincenzo Librandi_, Feb 18 2013 *)

%o (Magma) [Floor(n^(1/2)-n^(1/4)): n in [1..100]]; // _Vincenzo Librandi_, Feb 18 2013

%Y Cf. A000196, A048766, A134914, A135660, A135661, A135662.

%K nonn,easy

%O 1,16

%A _Mohammad K. Azarian_, Nov 25 2007

%E More terms from _N. J. A. Sloane_, Aug 08 2008

%E Offset changed from 0 to 1 by _Vincenzo Librandi_, Feb 18 2013