A184108 - OEIS

%I #5 Mar 30 2012 18:57:13

%S 1,5,7,9,11,12,14,15,17,19,20,21,23,24,26,27,29,30,31,33,34,35,37,38,

%T 39,41,42,43,44,46,47,48,49,51,52,53,55,56,57,58,59,61,62,63,64,66,67,

%U 68,69,71,72,73,74,75,77,78,79,80,81,83,84,85,86,87,89,90,91,92,93,94,96,97,98,99,100,101,103,104,105,106,107,109,110,111,112,113,114,115,117,118,119,120,121,122,124,125,126,127,128,129

%N n + floor(3*sqrt(n-1)); complement of A184109.

%F a(n) = n + floor(3*sqrt(n-1))

%t a=9; b=-9;

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

%t Table[n-1+Ceiling[(n*n-b)/a],{n,90}]

%Y Cf. A184109.

%K nonn,easy

%O 1,2

%A _Clark Kimberling_, Jan 09 2011