  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 
