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a(n) = n + floor(sqrt(n + 1)).
1

%I #12 Jan 19 2019 20:30:20

%S 1,2,3,5,6,7,8,9,11,12,13,14,15,16,17,19,20,21,22,23,24,25,26,27,29,

%T 30,31,32,33,34,35,36,37,38,39,41,42,43,44,45,46,47,48,49,50,51,52,53,

%U 55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,109

%N a(n) = n + floor(sqrt(n + 1)).

%p A183570 := proc(n) n+floor(sqrt(n+1)) ; end proc:

%p seq(A183570(n),n=0..100) ; # _R. J. Mathar_, Jan 29 2011

%Y Cf. A028552 (complement, except for initial term).

%K nonn,easy

%O 0,2

%A _Clark Kimberling_, Jan 05 2011

%E All terms corrected by _R. J. Mathar_, Jan 29 2011