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a(n) = 5*n - floor(3*n*sqrt(2)).
1

%I #13 Sep 08 2022 08:45:59

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

%T 21,22,22,23,24,25,25,26,27,28,29,29,30,31,32,32,33,34,35,35,36,37,38,

%U 38,39,40,41,41,42,43,44,44,45,46,47,47,48,49,50,50,51,52,53

%N a(n) = 5*n - floor(3*n*sqrt(2)).

%H Vincenzo Librandi, <a href="/A195180/b195180.txt">Table of n, a(n) for n = 0..10000</a>

%t Table[5*n - Floor[3*n*Sqrt[2]], {n,0,50}] (* _G. C. Greubel_, Nov 01 2017 *)

%o (Magma) [5*n-Floor(3*n*(Sqrt(2))): n in [0..70]]; // _Vincenzo Librandi_, Sep 12 2011

%o (PARI) for(n=0,50, print1(5*n - floor(3*n*sqrt(2)), ", ")) \\ _G. C. Greubel_, Nov 01 2017

%K nonn

%O 0,3

%A _Clark Kimberling_, Sep 10 2011