a) `Ư(5) = {1,5}, Ư(13) = {1,13} , Ư(16) = {1,2,4,8,16}`
b) `Ư(24) = {1,2,3,4,6,8,12,24} , Ư(26) = {1,2,13,26} , Ư(30) = {1,2,3,5,6,10,15,30}`
c) `B(17) = {0,17,34,51,...} , B(19) = {0,19,38,....} , B(27) = {0,27,54,81,....}`
d) `B(29) = {0,29,58,...} , B(16) = {0,16,32,48,...} , B(23) = {0,23,46,69,...}`
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