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a(n) = floor(n*(sqrt(13)-sqrt(7))).
1

%I #11 Sep 08 2022 08:45:50

%S 0,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,23,

%T 24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,

%U 47,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69

%N a(n) = floor(n*(sqrt(13)-sqrt(7))).

%H Vincenzo Librandi, <a href="/A172275/b172275.txt">Table of n, a(n) for n = 0..1000</a>

%t With[{c = Sqrt[13] - Sqrt[7]}, Floor[c Range[0, 80]]] (* _Harvey P. Dale_, Jan 22 2013 *)

%o (Magma) [Floor(n*(Sqrt(13)-Sqrt(7))): n in [0..80]]; // _Vincenzo Librandi_, Aug 01 2013

%Y Cf. A172264, A172266-A172270, A172272-A172278.

%K nonn,easy

%O 0,4

%A _Vincenzo Librandi_, Jan 30 2010