function x=corput(n,b)
% converts 1:n to  from van den corput number with base b
m=floor(log(n)/log(b));
n=1:n;
A=[];
for i=0:m
   a=rem(n,b);
  n=(n-a)/b;
A=[A ;a];
end
x=((1./b').^(1:(m+1)))*A;