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n+floor(sqrt(5n)); complement of A183873.
1

%I #6 Mar 30 2012 18:57:13

%S 3,5,6,8,10,11,12,14,15,17,18,19,21,22,23,24,26,27,28,30,31,32,33,34,

%T 36,37,38,39,41,42,43,44,45,47,48,49,50,51,52,54,55,56,57,58,60,61,62,

%U 63,64,65,66,68,69,70,71,72,73,75,76,77,78,79,80,81,83,84,85,86,87,88,89,90,92,93,94,95,96,97,98,100,101,102,103,104,105,106,107,108,110,111,112,113,114,115,116,117,119,120,121,122

%N n+floor(sqrt(5n)); complement of A183873.

%t a=5; b=0;

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

%t Table[n-1+Ceiling[(n*n-b)/a],{n,80}]

%Y Cf. A183873.

%K nonn,easy

%O 1,1

%A _Clark Kimberling_, Jan 07 2011