0 		- 0     * 0
1-254 		- 1     * 3937 to 1000000 Bpmil  1/x for (1 <= x <= 254)
255-509		- 2	* 3929 to 7843 Bpmil     2/x for (255 <= x <= 509)
510-764         - 3	* 
765-1019        - 4