new; cls;
t1=2; t2=18; dim=3; mindist=7;    /* 3 numbers between t1 and t2 with the min distance of 7 */


N=t2-t1+1-(dim-1)*mindist;
if N<1;
   errorlog "ERROR: Out of range.";
else;
   low=t1+seqa(0,mindist,dim);
   up=low+N-1;
   x=low;
   print/lz x';
   do while not x==up;
      x=recDindex(x,up,mindist);
      print/lz x';
   endo;
endif;


proc recDindex(x,up,mindist);
   local dim,j;
   dim=rows(x);
   x[dim]=x[dim]+1;
   j=dim;
   do until j==0;
      if x[j]==up[j]+1;
         x[j-1]=x[j-1]+1;
         if x[j-1]/=up[j-1]+1;
            x[j-1:dim]=x[j-1]+seqa(0,mindist,dim+1-(j-1));
         endif;
      endif;
      j=j-1;
   endo;
   retp(x);
endp;