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 A017913 #14 Sep 08 2022 08:44:43 %S A017913 1,1,3,5,9,15,27,46,81,140,243,420,729,1262,2187,3787,6561,11363, %T A017913 19683,34091,59049,102275,177147,306827,531441,920482,1594323,2761448, %U A017913 4782969,8284345,14348907,24853035,43046721 %N A017913 Powers of sqrt(3) rounded down. %H A017913 Vincenzo Librandi, <a href="/A017913/b017913.txt">Table of n, a(n) for n = 0..1000</a> %t A017913 Floor[(Sqrt[3])^Range[0,40]] (* _Vincenzo Librandi_, Nov 20 2011 *) %o A017913 (PARI) a(n)=sqrtint(3^n) \\ _Charles R Greathouse IV_, Nov 18 2011 %o A017913 (Magma) [Floor(Sqrt(3^n)): n in [0..40]]; // _Vincenzo Librandi_, Nov 20 2011 %K A017913 nonn %O A017913 0,3 %A A017913 _N. J. A. Sloane_