OFFSET
1,1
COMMENTS
Let u=1+sqrt(3) and v=sqrt(3). Jointly rank {j*u} and {k*v} as in the first comment at A182760; a(n) is the position of n*u.
FORMULA
a(n)=floor(n*(6+sqrt(3))/3).
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Nov 30 2010
STATUS
approved