Răspuns:
Explicație pas cu pas:
D15 = 1, 3, 5, 15
D72 = 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
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5, 10, 15, 20, 25
8, 16, 24, 32, 40
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x = 5
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2 divide 5500; 5522; 5544; 5566; 5588
200 si 255 se divid cu 5
y = 0
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222; 444; 666; 888
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1 + 2 + 3 + 4 + ...+ 64 = 64*65/2 = 32*65 = 4*8*65 se divide cu 4
