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%I #18 Jun 05 2022 11:49:09
%S 0,5,7,9,10,11,12,13,14,15,16,17,17,18,19,19,20,21,21,22,22,23,24,24,
%T 25,25,26,26,27,27,27,28,28,29,29,30,30,30,31,31,32,32,32,33,33,34,34,
%U 34,35,35,35,36,36,36,37,37,38,38,38,39,39,39,39,40,40,40
%N Nearest integer to sqrt(8*Pi*n).
%F a(n) = floor(sqrt(8*Pi*n) + 1/2).
%t Table[Floor[Sqrt[8*Pi*n] + 1/2, 1], {n, 0, 65}]
%Y Cf. A000194.
%K nonn
%O 0,2
%A _Mats Granvik_, May 30 2022
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