1-bisti3mal khawarizmyate o9lids hadid
pgcd(2^(12)-1;2^(
-1) , pgcd (2^(14)-1;2^(10)-1)
2- m wa n 3adadayne sahihayn tabi3yayne bihayte m asghar mene aw tossawi n wa r ba9i l9isma l o9lidya li n 3ala m
bayne ana 2^(r)-1 howa ba9i l 9isma lo9lidya li 2^(n)-1 3ala 2^(m)-1