  100 input "size" , size
  110 true = 1 : false = 0
  120 dim prime ( size ) 
  130 for i = 1 to size
  140  prime ( i ) = true
  150  next i
  160 for i = 0 to size
  170  if prime ( i ) = 0 then 210
  180  j = ( 2 * i ) + 3 : k = i + j
  190  if ( k <= size ) then prime ( k ) = false : k = k + j : goto 190
  200  print j , 
  210  rem
  220  next i
  230 print 
  240 end 
