A183870 - OEIS

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

%S 1,4,6,7,9,11,12,13,15,16,18,19,20,22,23,24,25,27,28,29,31,32,33,34,

%T 35,37,38,39,40,42,43,44,45,46,48,49,50,51,52,53,55,56,57,58,59,61,62,

%U 63,64,65,66,67,69,70,71,72,73,74,76,77,78,79,80,81,82,84,85,86,87,88,89,90,91,93,94,95,96,97,98,99,101,102,103,104,105,106,107,108,109,111,112,113,114,115,116,117,118,120,121,122

%N n+floor(sqrt(5n-5)); complement of A183871.

%F a(n)=n+floor(sqrt(5n-5)).

%t a=5; b=-5;

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

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

%Y Cf. A183871.

%K nonn,easy

%O 1,2

%A _Clark Kimberling_, Jan 07 2011