%I A083657
%S A083657 1,6,14,24,37,54,74,96,121,150,182,216,254,295,338,384,434,487,542,600,
%T A083657 662,727,794,865,939,1016,1095,1178,1264,1352,1443,1538,1636,1736,1839,
%U A083657 1946,2056,2168,2284,2403,2525,2649,2777,2908,3041,3177,3317,3460,3605
%N A083657 a(n)=sum(i=1,n,floor(r*floor(r*i))) where r=sqrt(3).
%F A083657 a(n) = (n/2)*(3n-1)+ n/sqrt(3) + O(1)
%Y A083657 Sequence in context: A107400 A104675 A028557 this_sequence A010740 A095794 
               A119867
%Y A083657 Adjacent sequences: A083654 A083655 A083656 this_sequence A083658 A083659 
               A083660
%K A083657 nonn
%O A083657 1,2
%A A083657 Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 13 2003