OFFSET
1,1
MAPLE
A183868 := proc(n) n+floor(2*sqrt(n+1)) ; end proc: # R. J. Mathar, Feb 06 2011
MATHEMATICA
Table[n+Floor[2*Sqrt[n+1]], {n, 60}] (* Harvey P. Dale, Nov 05 2013 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Jan 07 2011
STATUS
approved