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

%I #11 Sep 08 2022 08:45:59

%S 0,2,3,5,6,8,9,10,12,13,15,16,18,19,20,22,23,25,26,28,29,30,32,33,35,

%T 36,37,39,40,42,43,45,46,47,49,50,52,53,55,56,57,59,60,62,63,65,66,67,

%U 69,70,72,73,74,76,77,79,80,82,83,84,86,87,89,90,92,93,94,96,97,99

%N a(n) = 2*n - floor(n*sqrt(1/3)).

%H Vincenzo Librandi, <a href="/A195129/b195129.txt">Table of n, a(n) for n = 0..10000</a>

%o (Magma) [2*n-Floor(n*(Sqrt(1/3))): n in [0..70]]; // _Vincenzo Librandi_, Sep 12 2011

%K nonn

%O 0,2

%A _Clark Kimberling_, Sep 09 2011