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%I #17 Jul 29 2022 20:44:17
%S 0,2,4,6,7,9,11,13,14,16,18,20,21,23,25,26,28,30,32,33,35,37,39,40,42,
%T 44,46,47,49,51,52,54,56,58,59,61,63,65,66,68,70,72,73,75,77,78,80,82,
%U 84,85,87,89,91,92,94,96,97,99,101,103
%N a(n) = ceiling(n*sqrt(3)).
%H Vincenzo Librandi, <a href="/A198081/b198081.txt">Table of n, a(n) for n = 0..10000</a>
%t Ceiling[Range[0,60]Sqrt[3]] (* _Harvey P. Dale_, May 06 2012 *)
%o (Magma) [Ceiling(n*Sqrt(3)): n in [0..60]]
%o (Python)
%o from math import isqrt
%o def A198081(n): return 1+isqrt(3*n*n) if n else 0 # _Chai Wah Wu_, Jul 29 2022
%Y Cf. A022847.
%K nonn,easy
%O 0,2
%A _Vincenzo Librandi_, Oct 22 2011
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