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n+floor(sqrt(4n+5)); complement of A004116.
0

%I #8 Mar 30 2012 18:57:13

%S 2,4,5,7,8,10,11,12,14,15,16,18,19,20,21,23,24,25,26,28,29,30,31,32,

%T 34,35,36,37,38,40,41,42,43,44,45,47,48,49,50,51,52,54,55,56,57,58,59,

%U 60,62,63,64,65,66,67,68,70,71,72,73,74,75,76,77,79,80,81,82,83,84,85,86,88,89,90,91,92,93,94,95,96,98,99,100,101,102,103,104,105,106,108,109,110,111,112,113,114,115,116,117,119,120

%N n+floor(sqrt(4n+5)); complement of A004116.

%t a=4; b=5;

%t Table[n+Floor[(a*n+b)^(1/2)],{n,0,100}]

%Y Cf. A004116.

%K nonn,easy

%O 0,1

%A _Clark Kimberling_, Jan 07 2011