This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A135664 #15 Sep 08 2022 08:45:32
%S A135664 0,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,
%T A135664 4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
%U A135664 6,7,7,7,7,7,7,7,7,7
%N A135664 a(n) = ceiling(sqrt(n) - n^(1/5)).
%H A135664 Vincenzo Librandi, <a href="/A135664/b135664.txt">Table of n, a(n) for n = 1..1000</a>
%t A135664 Table[Ceiling[n^(1/2) - n^(1/5)], {n, 100}] (* _Vincenzo Librandi_, Feb 16 2013 *)
%o A135664 (Magma) [Ceiling(n^(1/2) - n^(1/5)): n in [1..100]]; // _Vincenzo Librandi_, Feb 16 2013
%Y A135664 Cf. A000196, A048766, A134914, A135660, A135661, A135662, A135663.
%K A135664 nonn,easy
%O A135664 1,6
%A A135664 _Mohammad K. Azarian_, Nov 25 2007
%E A135664 Offset corrected by _Mohammad K. Azarian_, Nov 19 2008