OFFSET
1,1
FORMULA
a(n) = n + floor(5*sqrt(n+1)).
MATHEMATICA
a=25; b=25; Table[n+Floor[(a*n+b)^(1/2)], {n, 100}]
Table[n+Floor[5*Sqrt[n+1]], {n, 100}] (* Harvey P. Dale, Aug 31 2023 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Jan 09 2011
EXTENSIONS
Definition corrected by Georg Fischer, Aug 28 2021
STATUS
approved