A172270 - OEIS

%I #13 Sep 08 2022 08:45:50

%S 0,1,2,3,4,5,6,7,8,9,10,11,12,14,15,16,17,18,19,20,21,22,23,24,25,27,

%T 28,29,30,31,32,33,34,35,36,37,38,39,41,42,43,44,45,46,47,48,49,50,51,

%U 52,54,55,56,57,58,59,60,61,62,63,64,65,66,68,69,70,71,72,73,74,75,76,77

%N a(n) = floor(n*(sqrt(11)-sqrt(5))).

%H Vincenzo Librandi, <a href="/A172270/b172270.txt">Table of n, a(n) for n = 0..1000</a>

%t With[{c=Sqrt[11]-Sqrt[5]},Floor[c*Range[0,80]]] (* _Harvey P. Dale_, Apr 24 2013 *)

%o (Magma) [Floor(n*(Sqrt(11)-Sqrt(5))): n in [0..80]]; // _Vincenzo Librandi_, Aug 01 2013

%o (PARI) a(n) = floor(n*(sqrt(11)-sqrt(5))) \\ _Charles R Greathouse IV_, Jul 01 2016

%Y Cf. A172264, A172266-A172269, A172272-A172278.

%K nonn,easy

%O 0,3

%A _Vincenzo Librandi_, Jan 30 2010

%E Checked by _Michael B. Porter_, Jun 16 2010