A={5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63}
B={3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48,51,54,57,60,63.....}
A∩B are 20 elemente
=>4<x≤63