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%I #20 Sep 08 2022 08:46:01
%S 0,1,2,3,3,3,4,4,4,5,5,5,6,6,6,6,6,7,7,7,7,7,8,8,8,8,8,9,9,9,9,9,9,9,
%T 10,10,10,10,10,10,10,11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,
%U 13,13,13,13,13,13,13,13,13,14,14,14
%N a(n) = floor(sqrt(3*n)).
%H Vincenzo Librandi, <a href="/A202304/b202304.txt">Table of n, a(n) for n = 0..10000</a>
%F a(n) = A000196(3n), a(n)^2 = A048760(3n). - _Bruno Berselli_, Jan 18 2012
%t Table[Floor[Sqrt[3n]],{n,0,80}]
%o (Magma) [Isqrt(3*n) : n in [0..80]];
%o (PARI) a(n)=sqrtint(3*n) \\ _Charles R Greathouse IV_, Jan 17 2012
%Y Cf. A060018, A172471.
%K nonn,easy
%O 0,3
%A _Vincenzo Librandi_, Jan 17 2012
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