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%I #16 Jul 29 2022 21:46:30
%S 0,3,6,9,12,15,17,20,23,26,29,32,34,37,40,43,46,49,51,54,57,60,63,66,
%T 68,71,74,77,80,83,85,88,91,94,97,99,102,105,108,111,114,116,119,122,
%U 125,128,131,133,136,139,142,145,148,150,153,156,159
%N a(n) = ceiling(n*sqrt(8)).
%H Vincenzo Librandi, <a href="/A198263/b198263.txt">Table of n, a(n) for n = 0..10000</a>
%t Ceiling[Range[0,60]Sqrt[8]] (* _Harvey P. Dale_, May 05 2012 *)
%o (Magma) [Ceiling(n*Sqrt(8)): n in [0..60]]
%o (Python)
%o from math import isqrt
%o def A198263(n): return 1+isqrt(n*n<<3) if n else 0 # _Chai Wah Wu_, Jul 29 2022
%Y Cf. A022842, A022851.
%K nonn
%O 0,2
%A _Vincenzo Librandi_, Oct 24 2011
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