Ư(30) = { 1; 2; 3; 6; 10; 15; 30 }
b, 225 = 3 . 3 . 5 . 5
Ư(225) = {1; 3; 5; 9; 15; 25; 45; 75; 225}
c, 210 = 2 . 3 . 5 . 7
Ư(210) = {1; 2; 3; 5; 6; 7; 10; 14; 15; 21; 30; 35; 42; 70; 105; 210}
d, 242 = 2 . 2 . 11. 11
Ư(242) = {1; 2; 11; 22; 121; 242}
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