OFFSET

1,1

FORMULA

a(n)=n+Floor[1/2+(n/5+1/5)^(1/2)].

MATHEMATICA

Table[n+Floor[1/2+(n/5+1/5)^(1/2)], {n, 100}]

CROSSREFS

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 01 2011

STATUS

approved